diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00db6a52e5d281f4f58fdca7adfc4025c90fa838..fe941d552e76a9e014ba4f7723842d17ad040b4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Unreleased
 
 ### Added
+- Added the PolyChord sampler, which can be accessed by using `sampler='pypolychord'` in `run_sampler`
 - `emcee` now writes all progress to disk and can resume from a previous run.
 
 ### Changed
diff --git a/Pipfile b/Pipfile
index 258de82a4c2b72f9f7ae4017c89054e6d8dd8db6..2b2b4d23524873c3c066e9c06390e2414eb24601 100644
--- a/Pipfile
+++ b/Pipfile
@@ -6,11 +6,12 @@ name = "pypi"
 [packages]
 future = "*"
 corner = "*"
-numpy = ">=1.9"
+numpy = "==1.15.2"
+ligotimegps = "<=1.2.3"
 matplotlib = "<3"
 scipy = ">=0.16"
-pandas = "*"
-deepdish = "*"
+pandas = "==0.23.0"
+deepdish = "==0.3.6"
 mock = "*"
 astropy = "<3"
 gwpy = "*"
@@ -23,7 +24,6 @@ emcee = "*"
 nestle = "*"
 ptemcee = "*"
 pymc3 = "*"
-pymultinest = "*"
 
 [requires]
 
diff --git a/Pipfile.lock b/Pipfile.lock
index 7300f095ed679ab40898a18ef20603994527611d..42634199226773a003c7358eae516c6cd9d1b8f8 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "dec6b7c15df6450bdbd7946533a3cf8c8d554a48e7ca711787eaf5bfcba6c492"
+            "sha256": "7c1f82e7840646851cc40ded7939ef8a712f4d922ab5cbbceab652366c9a48dc"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -23,26 +23,39 @@
         },
         "astropy": {
             "hashes": [
-                "sha256:13cdf1ba17d2ecbafc9fcb20d82d2aa53f0fc116a815d17357f86c0180215ffc",
-                "sha256:22051a03bb268a0426a0170366e4680553028c5f9282f335c575a850e7eb85ef",
-                "sha256:32fbaf565bebbbc91b64271e1f08870cf23c63a7f852e848df932324dedc8a07",
-                "sha256:53979303beb386038ac6dd69c1d08b148d518a915c8c1f9c45179b5f752739fc",
-                "sha256:9f354bdde7fd1261b14379553dc3500956ddba56afc80c021f8592138d827a51",
-                "sha256:a8015f84c42051342a2a8ee710868e682b9775a3b7948fdc1e87124bcd6e69dc",
-                "sha256:b284f9452dc8330a0bec13713a739d5714f01de5c473a31df80f1719fe56956c",
-                "sha256:d46f4e578c2e0b69b0ae4958c426ca12cbf7849c5cadba9200aa8866ae107dfe",
-                "sha256:d918ce1da85ee8c90f3e1f40be6a6743d33bcd992fe813bfc193dac8fd7a544a"
+                "sha256:010f5450a45a3d510aa46b98008a50bccfb8f5bc1430736faf0bc953e085c93c",
+                "sha256:0988be682b22c85e70b752967613342a7952075074e823fcb58fd516287d221c",
+                "sha256:0c14fcd0ad8ea3388392587a17384b3574ccc5e2f7db9f8c03b1ee7d78a26e4c",
+                "sha256:104b64643fb6ab05cfdf4a2f0f61d7b85f0a7f36a759683dea1ae9c8b5d957f1",
+                "sha256:1a2a9731cfa7e70104effa507934c0ff61463daf9cf34085ad63ee8f4af1d46e",
+                "sha256:424be12ee173267d8d0a209bd292336dda87f463fb201ec76a974eb25101016b",
+                "sha256:4847d1f94affa3071a8b091857e46d0b0ecf646899f29bb50c5b8cf5eb276a9a",
+                "sha256:56f39e872e80e0eefc5c84f62588e2ec570decf892b2cbc2860d0bde01324e80",
+                "sha256:8f4930da4c5fea2ed43452647b9a7da693d0be475a0fd0da1433b324b2d1b1b6",
+                "sha256:91a9394690ba0fc6ca49dc14bc76a8334c7b5c95d6e1a06f09673a089d5a9eae",
+                "sha256:9a4b207690b1e5fd308540d92888203c9f193a8900ca0f9bb1536a0230fdabf4",
+                "sha256:9a9da74df7a3b238778af7922921a0063b85f97e172d853b806fb6d2c5354bec",
+                "sha256:a437b92b95d617bb16972697f756ebf1409ccce0070fa3db90b596c9d6f0a2b2",
+                "sha256:a678f2db5e31b1af88b2d70b7577b8e3400e4bc153ff8cc0b025cc966475220c",
+                "sha256:b0182debddf44a3b7b5ae2919cd0c719c61bc7eb8bb0dd9131052ed9f1305b5c",
+                "sha256:becc6d9c784f86c9411ea343a297df23e56d1d174b1b504f78f834663436eae5",
+                "sha256:c409de7030215c5d5d8cbb405164bbfb8e546732babbeb096f25a8975106d964",
+                "sha256:ce094f45e4fa1cf8f3980c445d7cd75706bd73002ef62fb666851d4683460372",
+                "sha256:e15cdfc73962f54d4a1a696774bd622ba0a8936d70dec2444bd85c71a02faab8",
+                "sha256:e6279dc78aeaae8341d57719d166dda8493f381091f0ea39829514562a98d3bb",
+                "sha256:e6312b9a3277fcf63576ed5c9b194d388911192d3f0138880471742c7d850efa",
+                "sha256:efb07dd5ab924f6c43147700fc1f3d0968ab229ff26952ca9d062539c7ba57c5",
+                "sha256:f5776a9a4798c6ef7d2d0ea66c15e06127c3d333ee4561db9bebf1262bf2dcd8"
             ],
             "index": "pypi",
-            "version": "==2.0.8"
+            "version": "==2.0.11"
         },
         "atomicwrites": {
             "hashes": [
-                "sha256:0312ad34fcad8fac3704d441f7b317e50af620823353ec657a53e981f92920c0",
-                "sha256:ec9ae8adaae229e4f8446952d204a3e4b5fdd2d099f9be3aaf556120135fb3ee"
+                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
+                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
             ],
-            "markers": "python_version != '3.1.*' and python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.0.*'",
-            "version": "==1.2.1"
+            "version": "==1.3.0"
         },
         "attrs": {
             "hashes": [
@@ -97,27 +110,27 @@
         },
         "cryptography": {
             "hashes": [
-                "sha256:02602e1672b62e803e08617ec286041cc453e8d43f093a5f4162095506bc0beb",
-                "sha256:10b48e848e1edb93c1d3b797c83c72b4c387ab0eb4330aaa26da8049a6cbede0",
-                "sha256:17db09db9d7c5de130023657be42689d1a5f60502a14f6f745f6f65a6b8195c0",
-                "sha256:227da3a896df1106b1a69b1e319dce218fa04395e8cc78be7e31ca94c21254bc",
-                "sha256:2cbaa03ac677db6c821dac3f4cdfd1461a32d0615847eedbb0df54bb7802e1f7",
-                "sha256:31db8febfc768e4b4bd826750a70c79c99ea423f4697d1dab764eb9f9f849519",
-                "sha256:4a510d268e55e2e067715d728e4ca6cd26a8e9f1f3d174faf88e6f2cb6b6c395",
-                "sha256:6a88d9004310a198c474d8a822ee96a6dd6c01efe66facdf17cb692512ae5bc0",
-                "sha256:76936ec70a9b72eb8c58314c38c55a0336a2b36de0c7ee8fb874a4547cadbd39",
-                "sha256:7e3b4aecc4040928efa8a7cdaf074e868af32c58ffc9bb77e7bf2c1a16783286",
-                "sha256:8168bcb08403ef144ff1fb880d416f49e2728101d02aaadfe9645883222c0aa5",
-                "sha256:8229ceb79a1792823d87779959184a1bf95768e9248c93ae9f97c7a2f60376a1",
-                "sha256:8a19e9f2fe69f6a44a5c156968d9fc8df56d09798d0c6a34ccc373bb186cee86",
-                "sha256:8d10113ca826a4c29d5b85b2c4e045ffa8bad74fb525ee0eceb1d38d4c70dfd6",
-                "sha256:be495b8ec5a939a7605274b6e59fbc35e76f5ad814ae010eb679529671c9e119",
-                "sha256:dc2d3f3b1548f4d11786616cf0f4415e25b0fbecb8a1d2cd8c07568f13fdde38",
-                "sha256:e4aecdd9d5a3d06c337894c9a6e2961898d3f64fe54ca920a72234a3de0f9cb3",
-                "sha256:e79ab4485b99eacb2166f3212218dd858258f374855e1568f728462b0e6ee0d9",
-                "sha256:f995d3667301e1754c57b04e0bae6f0fa9d710697a9f8d6712e8cca02550910f"
-            ],
-            "version": "==2.3.1"
+                "sha256:05b3ded5e88747d28ee3ef493f2b92cbb947c1e45cf98cfef22e6d38bb67d4af",
+                "sha256:06826e7f72d1770e186e9c90e76b4f84d90cdb917b47ff88d8dc59a7b10e2b1e",
+                "sha256:08b753df3672b7066e74376f42ce8fc4683e4fd1358d34c80f502e939ee944d2",
+                "sha256:2cd29bd1911782baaee890544c653bb03ec7d95ebeb144d714b0f5c33deb55c7",
+                "sha256:31e5637e9036d966824edaa91bf0aa39dc6f525a1c599f39fd5c50340264e079",
+                "sha256:42fad67d7072216a49e34f923d8cbda9edacbf6633b19a79655e88a1b4857063",
+                "sha256:4946b67235b9d2ea7d31307be9d5ad5959d6c4a8f98f900157b47abddf698401",
+                "sha256:522fdb2809603ee97a4d0ef2f8d617bc791eb483313ba307cb9c0a773e5e5695",
+                "sha256:6f841c7272645dd7c65b07b7108adfa8af0aaea57f27b7f59e01d41f75444c85",
+                "sha256:7d335e35306af5b9bc0560ca39f740dfc8def72749645e193dd35be11fb323b3",
+                "sha256:8504661ffe324837f5c4607347eeee4cf0fcad689163c6e9c8d3b18cf1f4a4ad",
+                "sha256:9260b201ce584d7825d900c88700aa0bd6b40d4ebac7b213857bd2babee9dbca",
+                "sha256:9a30384cc402eac099210ab9b8801b2ae21e591831253883decdb4513b77a3cd",
+                "sha256:9e29af877c29338f0cab5f049ccc8bd3ead289a557f144376c4fbc7d1b98914f",
+                "sha256:ab50da871bc109b2d9389259aac269dd1b7c7413ee02d06fe4e486ed26882159",
+                "sha256:b13c80b877e73bcb6f012813c6f4a9334fcf4b0e96681c5a15dac578f2eedfa0",
+                "sha256:bfe66b577a7118e05b04141f0f1ed0959552d45672aa7ecb3d91e319d846001e",
+                "sha256:e091bd424567efa4b9d94287a952597c05d22155a13716bf5f9f746b9dc906d3",
+                "sha256:fa2b38c8519c5a3aa6e2b4e1cf1a549b54acda6adb25397ff542068e73d1ed00"
+            ],
+            "version": "==2.5"
         },
         "cycler": {
             "hashes": [
@@ -150,60 +163,58 @@
         },
         "future": {
             "hashes": [
-                "sha256:e39ced1ab767b5936646cedba8bcce582398233d6a627067d4c6a454c90cfedb"
+                "sha256:67045236dcfd6816dc439556d009594abf643e5eb48992e36beac09c2ca659b8"
             ],
             "index": "pypi",
-            "version": "==0.16.0"
+            "version": "==0.17.1"
         },
-        "gwpy": {
+        "gwosc": {
             "hashes": [
-                "sha256:3b6d2ba9a8844f6321c62ff3b9439f119e6447194b3d234944b5120a0856b5cc",
-                "sha256:74c5066e19e2b10dd0571ac0f0bd588b302d1f6de639a994021a580bb90d93f4"
+                "sha256:18ed53e2b0260bc2f41bfebcc196465081d97b92860b7083e321f9c39fb98ee2",
+                "sha256:f1ba1c0f076ddcc323427e22ff4516ff0ca7bead72a0131c6314ec8afeb750e4"
             ],
-            "index": "pypi",
-            "version": "==0.12.2"
+            "version": "==0.3.4"
         },
-        "h5py": {
+        "gwpy": {
             "hashes": [
-                "sha256:0f8cd2acbacf3177b4427ed42639c911667b1f24d923388ab1f8ad466a12be5e",
-                "sha256:11277e3879098f921ee9e29105b20591e1dfdd44963357399f2abaa1a280c560",
-                "sha256:1241dec0c94ac32f3285cac1d6f44beabf80423e422ab03bd2686d731a8a9294",
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-                "sha256:308e0758587ee16d4e73e7f2f8aae8351091e343bf0a43d2f697f9535465c816",
-                "sha256:37cacddf0e8209905f52537a8cf71da0dd9a4de62bd79247274c97b24a408997",
-                "sha256:38a23bb599748adf23d77f74885c0de6f4a7d9baa42f74e476bbf90fba2b47dd",
-                "sha256:47ab18b7b7bbc36fd2b606289b703b6f0ee915b923d6ad94dd17ac80ebffc280",
-                "sha256:486c78330af0bf33f5077b51d1888c0739c3cd1a03d5aade0d48572b3b5690ca",
-                "sha256:4e2183458d6ef1ae87dfb5d6acd0786359336cd9ac0ece6396c09b59fdaa3bd6",
-                "sha256:51d0595c3e58814c831f6cd2b664a5bf9590e26262c1d541b380d041e4fcb3c0",
-                "sha256:56d259d56822b70881760b243957f04a0cf133f0ec65eae6a33f562826aee899",
-                "sha256:5e6e777653169a3cc24ea56bb3d8c845ea391f8914c35bb6f350b0753a52891c",
-                "sha256:62bfb0ebb0f59e5dccc0b0dbbc0fc40dd1d1e09d04c0dc71f89790231531d4a2",
-                "sha256:67d89b64debfa021b54aa6f24bbf008403bd144748a0148596b518bce80d2fc4",
-                "sha256:6bf38571f555fa214493ec6349d29024cc5f313bf1715b09f236c553fd22ae4d",
-                "sha256:9214ca445c18a37bfe9c165982c0e317e2f21f035c8d635d1c6d9fcbaf35b7a8",
-                "sha256:ab0c52850428d2e86029935389379c2c97f752e76b616da851deec8a4484f8ec",
-                "sha256:b2eff336697d8dfd712c5d93fef9f4e4d3e97d9d8c258801836b8664a239e07a",
-                "sha256:bb33fabc0b8f3fe3bb0f8d6821b2fad5b2a64c27a0808e8d1c5c1e3362062064",
-                "sha256:bd5353ab342bae1262b04745934cc1565df4cbc8d6a979a0c98f42209bd5c265",
-                "sha256:bd73444efd1ac06dac27b8405bbe8791a02fd1bc8a2fa0e575257f90b7b57467",
-                "sha256:bd932236a2ef91a75fee5d7f4ace80ab494c5a59cd092a67c9785ddb7fdc218c",
-                "sha256:c45650de228ace7731e4280e14fb687f6d5c29cd666c5b22b42492b035e994d6",
-                "sha256:d5c0c01da45f901a3d429e7ef9e7e22baa869e1affb8715f1bf94e6a30020740",
-                "sha256:d75035db5bde802a29f4f29f18bb7548863d29ac90ccbf2c04c11799bbbba2c3",
-                "sha256:dda88206dc9464923f27f601000bc5b152ac0bd6d0122f098d4f239150a70076",
-                "sha256:e1c2ac5d0aa232c0f60fecc6bd1122346885086a176f939b91058c4c980cc226",
-                "sha256:e626c65a8587921ebc7fb8d31a49addfdd0b9a9aa96315ea484c09803337b955"
+                "sha256:0b939629deb6eaea8d60cbe1faf242ddcc445e99392697e03fe7a37d80d798d6",
+                "sha256:3da53fb6da72cae31b172093be90bc528109aa471f6b94507d74dd6a087fb930"
             ],
-            "version": "==2.8.0"
+            "index": "pypi",
+            "version": "==0.13.1"
         },
-        "idna": {
+        "h5py": {
             "hashes": [
-                "sha256:156a6814fb5ac1fc6850fb002e0852d56c0c8d2531923a51032d1b70760e186e",
-                "sha256:684a38a6f903c1d71d6d5fac066b58d7768af4de2b832e426ec79c30daa94a16"
-            ],
-            "version": "==2.7"
+                "sha256:05750b91640273c69989c657eaac34b091abdd75efc8c4824c82aaf898a2da0a",
+                "sha256:082a27208aa3a2286e7272e998e7e225b2a7d4b7821bd840aebf96d50977abbb",
+                "sha256:08e2e8297195f9e813e894b6c63f79372582787795bba2014a2db6a2de95f713",
+                "sha256:0dd2adeb2e9de5081eb8dcec88874e7fd35dae9a21557be3a55a3c7d491842a4",
+                "sha256:0f94de7a10562b991967a66bbe6dda9808e18088676834c0a4dcec3fdd3bcc6f",
+                "sha256:106e42e2e01e486a3d32eeb9ba0e3a7f65c12fa8998d63625fa41fb8bdc44cdb",
+                "sha256:1606c66015f04719c41a9863c156fc0e6b992150de21c067444bcb82e7d75579",
+                "sha256:1854c4beff9961e477e133143c5e5e355dac0b3ebf19c52cf7cc1b1ef757703c",
+                "sha256:1e9fb6f1746500ea91a00193ce2361803c70c6b13f10aae9a33ad7b5bd28e800",
+                "sha256:2cca17e80ddb151894333377675db90cd0279fa454776e0a4f74308376afd050",
+                "sha256:30e365e8408759db3778c361f1e4e0fe8e98a875185ae46c795a85e9bafb9cdf",
+                "sha256:3206bac900e16eda81687d787086f4ffd4f3854980d798e191a9868a6510c3ae",
+                "sha256:3c23d72058647cee19b30452acc7895621e2de0a0bd5b8a1e34204b9ea9ed43c",
+                "sha256:407b5f911a83daa285bbf1ef78a9909ee5957f257d3524b8606be37e8643c5f0",
+                "sha256:4162953714a9212d373ac953c10e3329f1e830d3c7473f2a2e4f25dd6241eef0",
+                "sha256:5fc7aba72a51b2c80605eba1c50dbf84224dcd206279d30a75c154e5652e1fe4",
+                "sha256:713ac19307e11de4d9833af0c4bd6778bde0a3d967cafd2f0f347223711c1e31",
+                "sha256:71b946d80ef3c3f12db157d7778b1fe74a517ca85e94809358b15580983c2ce2",
+                "sha256:8cc4aed71e20d87e0a6f02094d718a95252f11f8ed143bc112d22167f08d4040",
+                "sha256:9d41ca62daf36d6b6515ab8765e4c8c4388ee18e2a665701fef2b41563821002",
+                "sha256:a744e13b000f234cd5a5b2a1f95816b819027c57f385da54ad2b7da1adace2f3",
+                "sha256:b087ee01396c4b34e9dc41e3a6a0442158206d383c19c7d0396d52067b17c1cb",
+                "sha256:b0f03af381d33306ce67d18275b61acb4ca111ced645381387a02c8a5ee1b796",
+                "sha256:b9e4b8dfd587365bdd719ae178fa1b6c1231f81280b1375eef8626dfd8761bf3",
+                "sha256:c5dd4ec75985b99166c045909e10f0534704d102848b1d9f0992720e908928e7",
+                "sha256:d2b82f23cd862a9d05108fe99967e9edfa95c136f532a71cb3d28dc252771f50",
+                "sha256:e58a25764472af07b7e1c4b10b0179c8ea726446c7141076286e41891bf3a563",
+                "sha256:f3b49107fbfc77333fc2b1ef4d5de2abcd57e7ea3a1482455229494cf2da56ce"
+            ],
+            "version": "==2.9.0"
         },
         "joblib": {
             "hashes": [
@@ -243,48 +254,43 @@
                 "sha256:efabbcd4f406b532206b8801058c8bab9e79645b9880329253ae3322b7b02cd5",
                 "sha256:f923406e6b32c86309261b8195e24e18b6a8801df0cfc7814ac44017bfcb3939"
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             "version": "==1.0.1"
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         "lalsuite": {
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             "index": "pypi",
-            "version": "==6.49"
+            "version": "==6.52"
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+            "version": "==1.60.0"
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@@ -324,11 +330,11 @@
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         "more-itertools": {
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+            "version": "==5.0.0"
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@@ -339,35 +345,36 @@
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@@ -405,59 +412,44 @@
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-            "version": "==0.5.0"
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@@ -469,112 +461,99 @@
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             "hashes": [
-                "sha256:49639eb62e14f7735ecbb03fa79f1c5f59f2e971c8ce0168b86ed1929e2c14ee",
-                "sha256:6088e683c6d730bb21350a0f54ee083fa5a28e4d5ef52d57878141c9c20f21ee"
-            ],
-            "index": "pypi",
-            "version": "==3.5"
-        },
-        "pymultinest": {
-            "hashes": [
-                "sha256:42f1f5efa13c99b9faebd205151ac6136adfb86bb428a714deb3f489daa58f06",
-                "sha256:e5e76de90d226150659bc817e4a207556060bd91db1471e731d7734a7aa1826e"
+                "sha256:c00c0778d2451a348a9508f8b956fe280a0f9affd3f85140ac3948bc2902f5e9"
             ],
             "index": "pypi",
-            "version": "==2.6"
+            "version": "==3.6"
         },
         "pyopenssl": {
             "hashes": [
-                "sha256:26ff56a6b5ecaf3a2a59f132681e2a80afcc76b4f902f612f518f92c2a1bf854",
-                "sha256:6488f1423b00f73b7ad5167885312bb0ce410d3312eb212393795b53c8caa580"
+                "sha256:aeca66338f6de19d1aa46ed634c3b9ae519a64b458f8468aec688e7e3c20f200",
+                "sha256:c727930ad54b10fc157015014b666f2d8b41f70c0d03e83ab67624fd3dd5d1e6"
             ],
-            "version": "==18.0.0"
+            "version": "==19.0.0"
         },
         "pyparsing": {
             "hashes": [
-                "sha256:bc6c7146b91af3f567cf6daeaec360bc07d45ffec4cf5353f4d7a208ce7ca30a",
-                "sha256:d29593d8ebe7b57d6967b62494f8c72b03ac0262b1eed63826c6f788b3606401"
+                "sha256:66c9268862641abcac4a96ba74506e594c884e3f57690a696d21ad8210ed667a",
+                "sha256:f6c5ef0d7480ad048c054c37632c67fca55299990fff127850181659eea33fc3"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.6' and python_version != '3.1.*' and python_version != '3.0.*'",
-            "version": "==2.2.2"
+            "version": "==2.3.1"
         },
         "pytest": {
             "hashes": [
-                "sha256:0a72d8a9f559c006ba153e0c9b4838efd7b656cf1f993747ba7128770d6eb12c",
-                "sha256:95529588ff4e85114a0b0ad8e9cf0131ca47d46b28230e25366c5aba66b1d854"
+                "sha256:341ec10361b64a24accaec3c7ba5f7d5ee1ca4cebea30f76fad3dd12db9f0541",
+                "sha256:952c0389db115437f966c4c2079ae9d54714b9455190e56acebe14e8c38a7efa"
             ],
-            "markers": "python_version != '3.2.*' and python_version >= '2.7' and python_version != '3.3.*' and python_version != '3.1.*' and python_version != '3.0.*'",
-            "version": "==3.8.1"
+            "version": "==3.6.4"
         },
         "python-dateutil": {
             "hashes": [
-                "sha256:1adb80e7a782c12e52ef9a8182bebeb73f1d7e24e374397af06fb4956c8dc5c0",
-                "sha256:e27001de32f627c22380a688bcc43ce83504a7bc5da472209b4c70f02829f0b8"
+                "sha256:7e6584c74aeed623791615e26efd690f29817a27c73085b78e4bad02493df2fb",
+                "sha256:c89805f6f4d64db21ed966fda138f8a5ed7a4fdbc1a8ee329ce1b74e3c74da9e"
             ],
-            "version": "==2.7.3"
+            "version": "==2.8.0"
         },
         "pytz": {
             "hashes": [
-                "sha256:a061aa0a9e06881eb8b3b2b43f05b9439d6583c206d0a6c340ff72a7b6669053",
-                "sha256:ffb9ef1de172603304d9d2819af6f5ece76f2e85ec10692a524dd876e72bf277"
+                "sha256:32b0891edff07e28efe91284ed9c31e123d84bea3fd98e1f72be2508f43ef8d9",
+                "sha256:d5f05e487007e29e03409f9398d074e158d920d36eb82eaf66fb1136b0c5374c"
             ],
-            "version": "==2018.5"
+            "version": "==2018.9"
         },
         "scipy": {
             "hashes": [
-                "sha256:0611ee97296265af4a21164a5323f8c1b4e8e15c582d3dfa7610825900136bb7",
-                "sha256:08237eda23fd8e4e54838258b124f1cd141379a5f281b0a234ca99b38918c07a",
-                "sha256:0e645dbfc03f279e1946cf07c9c754c2a1859cb4a41c5f70b25f6b3a586b6dbd",
-                "sha256:0e9bb7efe5f051ea7212555b290e784b82f21ffd0f655405ac4f87e288b730b3",
-                "sha256:108c16640849e5827e7d51023efb3bd79244098c3f21e4897a1007720cb7ce37",
-                "sha256:340ef70f5b0f4e2b4b43c8c8061165911bc6b2ad16f8de85d9774545e2c47463",
-                "sha256:3ad73dfc6f82e494195144bd3a129c7241e761179b7cb5c07b9a0ede99c686f3",
-                "sha256:3b243c77a822cd034dad53058d7c2abf80062aa6f4a32e9799c95d6391558631",
-                "sha256:404a00314e85eca9d46b80929571b938e97a143b4f2ddc2b2b3c91a4c4ead9c5",
-                "sha256:423b3ff76957d29d1cce1bc0d62ebaf9a3fdfaf62344e3fdec14619bb7b5ad3a",
-                "sha256:42d9149a2fff7affdd352d157fa5717033767857c11bd55aa4a519a44343dfef",
-                "sha256:625f25a6b7d795e8830cb70439453c9f163e6870e710ec99eba5722775b318f3",
-                "sha256:698c6409da58686f2df3d6f815491fd5b4c2de6817a45379517c92366eea208f",
-                "sha256:729f8f8363d32cebcb946de278324ab43d28096f36593be6281ca1ee86ce6559",
-                "sha256:8190770146a4c8ed5d330d5b5ad1c76251c63349d25c96b3094875b930c44692",
-                "sha256:878352408424dffaa695ffedf2f9f92844e116686923ed9aa8626fc30d32cfd1",
-                "sha256:8b984f0821577d889f3c7ca8445564175fb4ac7c7f9659b7c60bef95b2b70e76",
-                "sha256:8f841bbc21d3dad2111a94c490fb0a591b8612ffea86b8e5571746ae76a3deac",
-                "sha256:c22b27371b3866c92796e5d7907e914f0e58a36d3222c5d436ddd3f0e354227a",
-                "sha256:d0cdd5658b49a722783b8b4f61a6f1f9c75042d0e29a30ccb6cacc9b25f6d9e2",
-                "sha256:d40dc7f494b06dcee0d303e51a00451b2da6119acbeaccf8369f2d29e28917ac",
-                "sha256:d8491d4784aceb1f100ddb8e31239c54e4afab8d607928a9f7ef2469ec35ae01",
-                "sha256:dfc5080c38dde3f43d8fbb9c0539a7839683475226cf83e4b24363b227dfe552",
-                "sha256:e24e22c8d98d3c704bb3410bce9b69e122a8de487ad3dbfe9985d154e5c03a40",
-                "sha256:e7a01e53163818d56eabddcafdc2090e9daba178aad05516b20c6591c4811020",
-                "sha256:ee677635393414930541a096fc8e61634304bb0153e4e02b75685b11eba14cae",
-                "sha256:f0521af1b722265d824d6ad055acfe9bd3341765735c44b5a4d0069e189a0f40",
-                "sha256:f25c281f12c0da726c6ed00535ca5d1622ec755c30a3f8eafef26cf43fede694"
+                "sha256:02cb79ea38114dc480e9b08d6b87095728e8fb39b9a49b449ee443d678001611",
+                "sha256:03c827cdbc584e935264040b958e5fa0570a16095bee23a013482ba3f0e963a2",
+                "sha256:04f2b23258139c109d0524f111597dd095a505d9cb2c71e381d688d653877fa3",
+                "sha256:3132a9fab3f3545c8b0ba15688d11857efdd4a58d388d3785dc474f56fea7138",
+                "sha256:4b1f0883cb9d8ee963cf0a31c87341e9e758abb2cf1e5bcc0d7b066ef6b17573",
+                "sha256:4cce25c6e7ff7399c67dfe1b5423c36c391cf9b4b2be390c1675ab410f1ef503",
+                "sha256:51a2424c8ed80e60bdb9a896806e7adaf24a58253b326fbad10f80a6d06f2214",
+                "sha256:5706b785ca289fdfd91aa05066619e51d140613b613e35932601f2315f5d8470",
+                "sha256:58f0435f052cb60f1472c77f52a8f6642f8877b70559e5e0b9a1744f33f5cbe5",
+                "sha256:63e1d5ca9e5e1984f1a275276991b036e25d39d37dd7edbb3f4f6165c2da7dbb",
+                "sha256:64b2c35824da3ef6bb1e722216e4ef28802af6413c7586136500e343d34ba179",
+                "sha256:6f791987899532305126309578727c0197bddbafab9596bafe3e7bfab6e1ce13",
+                "sha256:72bd766f753fd32f072d30d7bc2ad492d56dbcbf3e13764e27635d5c41079339",
+                "sha256:7413080b381766a22d52814edb65631f0e323a7cea945c70021a672f38acc73f",
+                "sha256:78a67ee4845440e81cfbfabde20537ca12051d0eeac951fe4c6d8751feac3103",
+                "sha256:7994c044bf659b0a24ad7673ec7db85c2fadb87e4980a379a9fd5b086fe3649a",
+                "sha256:7dc4002f0a0a688774ef04878afe769ecd1ac21fe9b4b1d7125e2cf16170afd3",
+                "sha256:854bd87cc23824d5db4983956bc30f3790e1c7448f1a9e6a8fb7bff7601aef87",
+                "sha256:8608316d0cc01f8b25111c8adfe6efbc959cbba037a62c784551568d7ffbf280",
+                "sha256:8f5fcc87b48fc3dd6d901669c89af4feeb856dffb6f671539a238b7e8af1799c",
+                "sha256:937147086e8b4338bf139ca8fa98da650e3a46bf2ca617f8e9dd68c3971ec420",
+                "sha256:bc294841f6c822714af362095b181a853f47ed5ce757354bd2e4776d579ff3a4",
+                "sha256:bc6a88b0009a1b60eab5c22ac3a006f6968d6328de10c6a64ebb0d64a05548d3",
+                "sha256:c5eae911cf26b3c7eda889ec98d3c226f312c587acfaaf02602473f98b4c16d6",
+                "sha256:cca33a01a5987c650b87a1a910aa311ffa44e67cca1ff502ef9efdae5d9a8624",
+                "sha256:d1ae77b79fd5e27a10ba7c4e7c3a62927b9d29a4dccf28f6905c25d983aaf183",
+                "sha256:fb36064047e6bf87b6320a9b6eb7f525ef6863c7a4aef1a84a4bbfb043612617",
+                "sha256:fc1a19d95649439dbd50baca676bceb29bbfcd600aed2c5bd71d9bad82a87cfe"
             ],
             "index": "pypi",
-            "version": "==1.1.0"
+            "version": "==1.2.0"
         },
         "six": {
             "hashes": [
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
+                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
+                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
             ],
-            "version": "==1.11.0"
+            "version": "==1.12.0"
         },
         "tables": {
             "hashes": [
@@ -592,29 +571,30 @@
                 "sha256:bdc5c073712af2a43babd139c4855fc99496bb2c3f3f5d1b4770a985e6f9ce29",
                 "sha256:bed4f423dd33600907f1c3b88f994920f2b879b12bf83d4372f861ef4085e085",
                 "sha256:c3ac22e3391f67a381d9a3018fd7e0a1ccfcc88b5f61b0d051fe5eba8196388f",
+                "sha256:d263f4380a5dad862efac774428bacb04c2339c4f165f2efdd228867abaffcf6",
                 "sha256:da98c8abfeefefad40110b994d5d06ac28d89b00d085530d377376b201566ebf",
                 "sha256:e2e4e40d010a6aa0464e5e281d4aa15f64acd99fd881c0e1e4c1c567b7167dba",
                 "sha256:e3bd7084dbf80ef347ad5d33645584e0fe7f8353cf2c33d8922a4c00034fa015",
                 "sha256:e8f9b20b9623c900e7007b89a9d3e315280b666ac70b38b0c191345f7d4d8585",
                 "sha256:f786d310cf954eaf52340680dfbc5c1190afc276093f5c454fab605a11488306",
-                "sha256:f97c8b5ebec23894fc56af25c6e73bc86b463cbccb1f9b9887def24cd7811e2c"
+                "sha256:f97c8b5ebec23894fc56af25c6e73bc86b463cbccb1f9b9887def24cd7811e2c",
+                "sha256:fd3e774ff048de838df39b018c171bff3ecd9f34a908395a475ba07ac270a34a"
             ],
             "version": "==3.4.4"
         },
         "theano": {
             "hashes": [
-                "sha256:637f3b34d40ef5e0d54dd4c40618475aaa085c26d2491e925c98e2ad4bc2115a"
+                "sha256:35c9bbef56b61ffa299265a42a4e8f8cb5a07b2997dabaef0f8830b397086913"
             ],
             "index": "pypi",
-            "version": "==1.0.3"
+            "version": "==1.0.4"
         },
         "tqdm": {
             "hashes": [
-                "sha256:18f1818ce951aeb9ea162ae1098b43f583f7d057b34d706f66939353d1208889",
-                "sha256:df02c0650160986bac0218bb07952245fc6960d23654648b5d5526ad5a4128c9"
+                "sha256:13f018038711256ed27aae118a80d63929588e90f00d072a0f4eb7aa3333b4dc",
+                "sha256:dd60ea2567baa013c625153ce41fd274209c69a5814513e1d635f20e5cd61b97"
             ],
-            "markers": "python_version != '3.1.*' and python_version >= '2.6' and python_version != '3.0.*'",
-            "version": "==4.26.0"
+            "version": "==4.30.0"
         }
     },
     "develop": {}
diff --git a/bilby/core/result.py b/bilby/core/result.py
index 691812db9dadcac7b8f6792f9aa6191090869e8d..5c95f1e834fc7eb0b43f2c28d7a5b38335d1d725 100644
--- a/bilby/core/result.py
+++ b/bilby/core/result.py
@@ -157,7 +157,15 @@ class Result(object):
             else:
                 filename = result_file_name(outdir, label)
         if os.path.isfile(filename):
-            return cls(**deepdish.io.load(filename))
+            dictionary = deepdish.io.load(filename)
+            # Some versions of deepdish/pytables return the dictionanary as
+            # a dictionary with a kay 'data'
+            if len(dictionary) == 1 and 'data' in dictionary:
+                dictionary = dictionary['data']
+            try:
+                return cls(**dictionary)
+            except TypeError as e:
+                raise IOError("Unable to load dictionary, error={}".format(e))
         else:
             raise IOError("No result '{}' found".format(filename))
 
diff --git a/bilby/core/sampler/__init__.py b/bilby/core/sampler/__init__.py
index 76b1589b2f5f0af474779fa776dcd495557f58a2..7a15b410cb1fb9ef4d425610a16bbd3c9d4ccc3b 100644
--- a/bilby/core/sampler/__init__.py
+++ b/bilby/core/sampler/__init__.py
@@ -11,20 +11,21 @@ from .cpnest import Cpnest
 from .dynesty import Dynesty
 from .emcee import Emcee
 from .nestle import Nestle
+from .polychord import PyPolyChord
 from .ptemcee import Ptemcee
 from .ptmcmc import PTMCMCSampler
 from .pymc3 import Pymc3
 from .pymultinest import Pymultinest
 
-implemented_samplers = {
+IMPLEMENTED_SAMPLERS = {
     'cpnest': Cpnest, 'dynesty': Dynesty, 'emcee': Emcee, 'nestle': Nestle,
     'ptemcee': Ptemcee,'ptmcmcsampler' : PTMCMCSampler,
-    'pymc3': Pymc3, 'pymultinest': Pymultinest }
+    'pymc3': Pymc3, 'pymultinest': Pymultinest, 'pypolychord': PyPolyChord }
 
 if command_line_args.sampler_help:
     sampler = command_line_args.sampler_help
-    if sampler in implemented_samplers:
-        sampler_class = implemented_samplers[sampler]
+    if sampler in IMPLEMENTED_SAMPLERS:
+        sampler_class = IMPLEMENTED_SAMPLERS[sampler]
         print('Help for sampler "{}":'.format(sampler))
         print(sampler_class.__doc__)
     else:
@@ -33,7 +34,7 @@ if command_line_args.sampler_help:
                   'the name of the sampler')
         else:
             print('Requested sampler {} not implemented'.format(sampler))
-        print('Available samplers = {}'.format(implemented_samplers))
+        print('Available samplers = {}'.format(IMPLEMENTED_SAMPLERS))
 
     sys.exit()
 
@@ -106,7 +107,7 @@ def run_sampler(likelihood, priors=None, label='label', outdir='outdir',
     if command_line_args.clean:
         kwargs['resume'] = False
 
-    from . import implemented_samplers
+    from . import IMPLEMENTED_SAMPLERS
 
     if priors is None:
         priors = dict()
@@ -128,15 +129,15 @@ def run_sampler(likelihood, priors=None, label='label', outdir='outdir',
     if isinstance(sampler, Sampler):
         pass
     elif isinstance(sampler, str):
-        if sampler.lower() in implemented_samplers:
-            sampler_class = implemented_samplers[sampler.lower()]
+        if sampler.lower() in IMPLEMENTED_SAMPLERS:
+            sampler_class = IMPLEMENTED_SAMPLERS[sampler.lower()]
             sampler = sampler_class(
                 likelihood, priors=priors, outdir=outdir, label=label,
                 injection_parameters=injection_parameters, meta_data=meta_data,
                 use_ratio=use_ratio, plot=plot, result_class=result_class,
                 **kwargs)
         else:
-            print(implemented_samplers)
+            print(IMPLEMENTED_SAMPLERS)
             raise ValueError(
                 "Sampler {} not yet implemented".format(sampler))
     elif inspect.isclass(sampler):
@@ -148,7 +149,7 @@ def run_sampler(likelihood, priors=None, label='label', outdir='outdir',
     else:
         raise ValueError(
             "Provided sampler should be a Sampler object or name of a known "
-            "sampler: {}.".format(', '.join(implemented_samplers.keys())))
+            "sampler: {}.".format(', '.join(IMPLEMENTED_SAMPLERS.keys())))
 
     if sampler.cached_result:
         logger.warning("Using cached result")
diff --git a/bilby/core/sampler/polychord.py b/bilby/core/sampler/polychord.py
new file mode 100644
index 0000000000000000000000000000000000000000..4378649335da69a5a4e852e9831b19b40c5d0c9a
--- /dev/null
+++ b/bilby/core/sampler/polychord.py
@@ -0,0 +1,94 @@
+from __future__ import absolute_import
+
+import numpy as np
+
+from .base_sampler import NestedSampler
+
+
+class PyPolyChord(NestedSampler):
+
+    """
+    Bilby wrapper of PyPolyChord
+    https://arxiv.org/abs/1506.00171
+
+    PolyChordLite is available at:
+    https://github.com/PolyChord/PolyChordLite
+
+    Follow the installation instructions at their github page.
+
+    Keyword arguments will be passed into `pypolychord.run_polychord` into the `settings`
+    argument. See the PolyChord documentation for what all of those mean.
+
+    To see what the keyword arguments are for, see the docstring of PyPolyChordSettings
+    """
+
+    default_kwargs = dict(use_polychord_defaults=False, nlive=None, num_repeats=None,
+                          nprior=-1, do_clustering=True, feedback=1, precision_criterion=0.001,
+                          logzero=-1e30, max_ndead=-1, boost_posterior=0.0, posteriors=True,
+                          equals=True, cluster_posteriors=True, write_resume=True,
+                          write_paramnames=False, read_resume=True, write_stats=True,
+                          write_live=True, write_dead=True, write_prior=True,
+                          compression_factor=np.exp(-1), base_dir='outdir',
+                          file_root='polychord', seed=-1, grade_dims=None, grade_frac=None, nlives={})
+
+    def run_sampler(self):
+        import pypolychord
+        from pypolychord.settings import PolyChordSettings
+        if self.kwargs['use_polychord_defaults']:
+            settings = PolyChordSettings(nDims=self.ndim, nDerived=self.ndim, base_dir=self.outdir,
+                                         file_root=self.label)
+        else:
+            self._setup_dynamic_defaults()
+            pc_kwargs = self.kwargs.copy()
+            pc_kwargs['base_dir'] = self.outdir
+            pc_kwargs['file_root'] = self.label
+            pc_kwargs.pop('use_polychord_defaults')
+            settings = PolyChordSettings(nDims=self.ndim, nDerived=self.ndim, **pc_kwargs)
+        self._verify_kwargs_against_default_kwargs()
+
+        pypolychord.run_polychord(loglikelihood=self.log_likelihood, nDims=self.ndim,
+                                  nDerived=self.ndim, settings=settings, prior=self.prior_transform)
+
+        self.result.log_evidence, self.result.log_evidence_err = self._read_out_stats_file()
+        self.result.samples = self._read_sample_file()
+        return self.result
+
+    def _setup_dynamic_defaults(self):
+        """ Sets up some interdependent default argument if none are given by the user """
+        if not self.kwargs['grade_dims']:
+            self.kwargs['grade_dims'] = [self.ndim]
+        if not self.kwargs['grade_frac']:
+            self.kwargs['grade_frac'] = [1.0] * len(self.kwargs['grade_dims'])
+        if not self.kwargs['nlive']:
+            self.kwargs['nlive'] = self.ndim * 25
+        if not self.kwargs['num_repeats']:
+            self.kwargs['num_repeats'] = self.ndim * 5
+
+    def _translate_kwargs(self, kwargs):
+        if 'nlive' not in kwargs:
+            for equiv in self.npoints_equiv_kwargs:
+                if equiv in kwargs:
+                    kwargs['nlive'] = kwargs.pop(equiv)
+
+    def log_likelihood(self, theta):
+        """ Overrides the log_likelihood so that PolyChord understands it """
+        return super(PyPolyChord, self).log_likelihood(theta), theta
+
+    def _read_out_stats_file(self):
+        statsfile = self.outdir + '/' + self.label + '.stats'
+        with open(statsfile) as f:
+            for line in f:
+                if line.startswith('log(Z)'):
+                    line = line.replace('log(Z)', '')
+                    line = line.replace('=', '')
+                    line = line.replace(' ', '')
+                    print(line)
+                    z = line.split('+/-')
+                    log_z = float(z[0])
+                    log_z_err = float(z[1])
+                    return log_z, log_z_err
+
+    def _read_sample_file(self):
+        sample_file = self.outdir + '/' + self.label + '_equal_weights.txt'
+        samples = np.loadtxt(sample_file)
+        return samples[:, -self.ndim:]  # extract last ndim columns
diff --git a/docs/samplers.txt b/docs/samplers.txt
index ee37613391531e9917b0ff9af8256b27efc12203..c497beb6ab8806cb9fb790fd316de59d0c0b7570 100644
--- a/docs/samplers.txt
+++ b/docs/samplers.txt
@@ -48,7 +48,7 @@ you would use
    is given in the API information below.
 
 Below, we give the detailed API for the samplers. Remember, this API is not
-recomended for direct use by the user, rather it should be accessed via the
+recommended for direct use by the user, rather it should be accessed via the
 :code:`run_sampler`.
 
 ---------------
@@ -60,6 +60,7 @@ Dynesty
 
 .. autoclass:: bilby.core.sampler.dynesty.Dynesty
 
+
 Nestle
 ======
 
@@ -71,11 +72,19 @@ CPNest
 
 .. autoclass:: bilby.core.sampler.cpnest.Cpnest
 
+
 PyMultinest
 ===========
 
 .. autoclass:: bilby.core.sampler.pymultinest.Pymultinest
 
+
+PyPolyChord
+===========
+
+.. autoclass:: bilby.core.sampler.pypolychord.PyPolyChord
+
+
 -------------
 MCMC samplers
 -------------
@@ -123,6 +132,27 @@ be found in the at the top-level of `the repository
 <https://git.ligo.org/lscsoft/bilby>`_ (Note: if you installed from pip, you
 can simply download that file and use the command above).
 
+
+Installing PyPolyChord
+======================
+
+If you want to use the `PyPolyChord` sampler, you first need the
+PolyChord library to be installed to work properly. An image of PolyChord can be found on github.
+Clone the following repository onto your system. Navigate to the folder you want to install PolyChord in and run:
+
+.. code-block:: console
+
+   $ git clone https://github.com/PolyChord/PolyChordLite.git
+
+Then navigate into the PolyChord directory and install PolyChord/PyPolyChord with
+
+.. code-block:: console
+
+   $ make pypolychord MPI=
+   $ python setup.py install --user
+
+Add a number after `MPI=` to compile with `MPI`. Leave it like it is if you don't wish to compile with MPI.
+
 Installing pymultinest
 ======================
 
diff --git a/test/sampler_test.py b/test/sampler_test.py
index 0ffbb2bac84f0096fa8dc7e20052b0ad1ee09b78..3054ad4ae52d57b88ae31e0dc217069d2c0c0f5b 100644
--- a/test/sampler_test.py
+++ b/test/sampler_test.py
@@ -5,6 +5,8 @@ import unittest
 from mock import MagicMock
 import numpy as np
 import os
+import sys
+import shutil
 import copy
 
 
@@ -247,6 +249,53 @@ class TestNestle(unittest.TestCase):
             self.assertDictEqual(expected, self.sampler.kwargs)
 
 
+class TestPolyChord(unittest.TestCase):
+
+    def setUp(self):
+        self.likelihood = MagicMock()
+        self.priors = dict(a=bilby.prior.Uniform(0, 1))
+        self.sampler = bilby.core.sampler.PyPolyChord(self.likelihood, self.priors,
+                                                      outdir='outdir', label='polychord',
+                                                      use_ratio=False, plot=False,
+                                                      skip_import_verification=True)
+
+    def tearDown(self):
+        del self.likelihood
+        del self.priors
+        del self.sampler
+
+    def test_default_kwargs(self):
+        expected = dict(use_polychord_defaults=False, nlive=self.sampler.ndim*25, num_repeats=self.sampler.ndim*5,
+                        nprior=-1, do_clustering=True, feedback=1, precision_criterion=0.001,
+                        logzero=-1e30, max_ndead=-1, boost_posterior=0.0, posteriors=True,
+                        equals=True, cluster_posteriors=True, write_resume=True,
+                        write_paramnames=False, read_resume=True, write_stats=True,
+                        write_live=True, write_dead=True, write_prior=True,
+                        compression_factor=np.exp(-1), base_dir='outdir',
+                        file_root='polychord', seed=-1, grade_dims=list([self.sampler.ndim]),
+                        grade_frac=list([1.0]*len([self.sampler.ndim])), nlives={})
+        self.sampler._setup_dynamic_defaults()
+        self.assertDictEqual(expected, self.sampler.kwargs)
+
+    def test_translate_kwargs(self):
+        expected = dict(use_polychord_defaults=False, nlive=123, num_repeats=self.sampler.ndim*5,
+                        nprior=-1, do_clustering=True, feedback=1, precision_criterion=0.001,
+                        logzero=-1e30, max_ndead=-1, boost_posterior=0.0, posteriors=True,
+                        equals=True, cluster_posteriors=True, write_resume=True,
+                        write_paramnames=False, read_resume=True, write_stats=True,
+                        write_live=True, write_dead=True, write_prior=True,
+                        compression_factor=np.exp(-1), base_dir='outdir',
+                        file_root='polychord', seed=-1, grade_dims=list([self.sampler.ndim]),
+                        grade_frac=list([1.0]*len([self.sampler.ndim])), nlives={})
+        self.sampler._setup_dynamic_defaults()
+        for equiv in bilby.core.sampler.base_sampler.NestedSampler.npoints_equiv_kwargs:
+            new_kwargs = self.sampler.kwargs.copy()
+            del new_kwargs['nlive']
+            new_kwargs[equiv] = 123
+            self.sampler.kwargs = new_kwargs
+            self.assertDictEqual(expected, self.sampler.kwargs)
+
+
 class TestPTEmcee(unittest.TestCase):
 
     def setUp(self):
@@ -397,11 +446,13 @@ class TestRunningSamplers(unittest.TestCase):
 
         self.priors = dict(
             m=bilby.core.prior.Uniform(0, 5), c=bilby.core.prior.Uniform(-2, 2))
+        bilby.core.utils.check_directory_exists_and_if_not_mkdir('outdir')
 
     def tearDown(self):
         del self.likelihood
         del self.priors
         bilby.core.utils.command_line_args.test = False
+        shutil.rmtree('outdir')
 
     def test_run_cpnest(self):
         _ = bilby.run_sampler(
@@ -423,6 +474,11 @@ class TestRunningSamplers(unittest.TestCase):
             likelihood=self.likelihood, priors=self.priors, sampler='nestle',
             nlive=100, save=False)
 
+    def test_run_pypolychord(self):
+        _ = bilby.run_sampler(
+            likelihood=self.likelihood, priors=self.priors,
+            sampler='pypolychord', nlive=100, save=False)
+
     def test_run_ptemcee(self):
         _ = bilby.run_sampler(
             likelihood=self.likelihood, priors=self.priors, sampler='ptemcee',