# GWs event parameter estimation posterior **URL:** \ **Category:** Data Analysis\ **Tags:** odw-2022, conda\ **Created:** [November 8, 2024, 9:56pm UTC](https://ask.igwn.org/t/gws-event-parameter-estimation-posterior/1135 "2024-11-08T21:56:16Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Raghad](https://yyz1.discourse-cdn.com/flex031/user_avatar/ask.igwn.org/raghad/32/336_2.png) [@Raghad](https://ask.igwn.org/u/Raghad)\ **Post date:** [November 8, 2024, 9:56pm UTC](https://ask.igwn.org/t/gws-event-parameter-estimation-posterior/1135/1 "2024-11-08T21:56:17Z")
Hello. I have some questions about the h5 datasets files that I found in LIGO documentation Regarding the parameter estimation posterior events of the released datasets, what is the essential difference between a Cosmos datatype and a non-Cosmos datatype? What datasets are usually used in research, and how do I know which model analysis to use for each event? What are the crucial points about the event datasets for events falling in the lower mass gap? Thank you! ---
**Author:** ![jonah](https://yyz1.discourse-cdn.com/flex031/user_avatar/ask.igwn.org/jonah/32/10_2.png) [@jonah](https://ask.igwn.org/u/jonah)\ **Post date:** [December 17, 2024, 5:16pm UTC](https://ask.igwn.org/t/gws-event-parameter-estimation-posterior/1135/2 "2024-12-17T17:16:14Z")
Hi, The docs for the posterior sample files are in the [zenodo release](https://zenodo.org/records/8177023). In particular: > There are two .h5 files per event > > - Cosmologically reweighted (\*cosmo.h5) > - Not cosmologically reweighted (\*nocosmo.h5) > The cosmologically reweighted posteriors are reweighted to have a luminosity-distance prior that has a uniform merger rate in the source’s comoving frame. See the [paper](http://dcc.ligo.org/LIGO-P2000318/public) appendices for further information. In general, I would recommend the “cosmologically reweighted” samples, since those should better account for red-shift effects.