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# 190923
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## Agenda
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- GW170817: [comparison page: low-spin, fixed-sky, IMRPhenomPv2_NRTidal, with calibration](https://ldas-jobs.ligo.caltech.edu/~gregory.ashton/bilby_pe_event_samples/GW170817/comparison_lowspin/home.html)
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- GW170817: future tests
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- Proposed review statement
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> Reviewers: Matt Pitkin & Simon Stevenson
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>
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> Review statement:
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>
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> The review of the parameter-estimation code Bilby has been completed. Full details and minutes of meetings are recorded at https://git.ligo.org/lscsoft/bilby_pipe/wikis/O3-review. Here we provide a summary of the salient points of the review.
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>
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> Review items pertaining to simulations
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> Runs on fiducial simulated events in Gaussian noise for IMRPhenomPv2
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> PP tests demonstrating the Dynesty sampler works without bias for IMRPhenomPv2 with spins up to 0.8 across a range of typical masses
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> Various sanity checks, including waveform outputs, 15-dimensional Gaussians, and confirming the sampler returns the prior when the likelihood is uninformative.
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>
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> Review items pertaining to GW150914, GW151226, GW170814, and GW170817:
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> General comments on like-for-like comparison of Bilby and LALInference
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> The criteria for passing this test is that the difference between the LALInference Nest and MCMC samplers is comparable to the difference between Bilby with either of these samplers.
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> Differences are noted for the spin-angles,which is due to the change in the LALSuite waveforms interface between O2 and O3. This was confirmed by looking at S190521r and by point 3 below.
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> For GW170817, the comparison was made using a custom-built ROQ on the fixed-sky low-spin case, future analysis of the high-spin case is planned.
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> A like-for-like comparison of IMPhenomD, IMRPhenomC, and SEOBNRv3_ROM on GW150914, demonstrating that Bilby is comparable across waveforms.
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> A comparison of both Bilby and LALInference run using IMRPhenomPv2 with and without calibration on GW150914, demonstrating similar changes in the source-parameter posteriors.
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>
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> Note: only four known events were selected for closer examination, the other seven events from GWTC1 were not inspected. A PE-group publication is planned producing results for all events in GWTC1.
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- AOB |
