# Data Analysis **URL:** https://ask.igwn.org/c/data-analysis/6.md?page=2 [Latest](https://ask.igwn.org/latest.md) · [Categories](https://ask.igwn.org/categories.md) · [Tags](https://ask.igwn.org/tags.md) **Page:** 3 --- ## [Definition of time when "t = 0" in different waveforms](https://ask.igwn.org/t/definition-of-time-when-t-0-in-different-waveforms/1106)
**Author:** [@CalTNG](https://ask.igwn.org/u/CalTNG)\ **Replies:** 0\ **Last updated:** [September 23, 2024, 3:15pm UTC](https://ask.igwn.org/t/definition-of-time-when-t-0-in-different-waveforms/1106 "2024-09-23T15:15:26Z")
Hi all, I am confused about the definition of time when t = 0. As the file of IMRPhenomXHM in the LALSimulation says, the time when t = 0 refers to the time of coalescence, while I found no clear definition of t0 for EOB… --- ## [Data with detector noise](https://ask.igwn.org/t/data-with-detector-noise/940)
**Author:** [@rbadan](https://ask.igwn.org/u/rbadan)\ **Replies:** 4\ **Last updated:** [September 23, 2024, 1:06pm UTC](https://ask.igwn.org/t/data-with-detector-noise/940 "2024-09-23T13:06:45Z")
I’m creating a dataset with simulated gravitational waves. The objective is to train different ML models with it. Is there a file containing plain detector noise (without signals or glitches) available anywhere? --- ## [Using waveforms without spin in pBilby](https://ask.igwn.org/t/using-waveforms-without-spin-in-pbilby/1099)
**Author:** [@CalTNG](https://ask.igwn.org/u/CalTNG)\ **Replies:** 0\ **Last updated:** [September 14, 2024, 7:20am UTC](https://ask.igwn.org/t/using-waveforms-without-spin-in-pbilby/1099 "2024-09-14T07:20:57Z")
Hi, I am an undergraduate student from Wuhan University and I am currently doing a project about GW with some waveforms without spin such as EccentricFD. I noticed that when there’s no prior about spin(eg. a\_1, a\_2 or c… --- ## [Is Windows or Linux the best environment to use for the workshop?](https://ask.igwn.org/t/is-windows-or-linux-the-best-environment-to-use-for-the-workshop/139)
**Author:** [@jcoggins](https://ask.igwn.org/u/jcoggins)\ **Replies:** 3\ **Last updated:** [August 24, 2024, 11:06pm UTC](https://ask.igwn.org/t/is-windows-or-linux-the-best-environment-to-use-for-the-workshop/139 "2024-08-24T23:06:42Z")
Hello. I have both Windows and Linux on my laptop. Do any of you experienced users see an advantage using either Windows or Linux? --- ## [Issues with PE Samples of GWTC-3](https://ask.igwn.org/t/issues-with-pe-samples-of-gwtc-3/1077)
**Author:** [@DicongLiang](https://ask.igwn.org/u/DicongLiang)\ **Replies:** 2\ **Last updated:** [August 21, 2024, 5:43pm UTC](https://ask.igwn.org/t/issues-with-pe-samples-of-gwtc-3/1077 "2024-08-21T17:43:42Z")
Hi all. I am studying the PE samples of GWTC-3 via GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run — Parameter estimation data release . In the last cell … --- ## [Complete versions of software or platforms used for real research](https://ask.igwn.org/t/complete-versions-of-software-or-platforms-used-for-real-research/1085)
**Author:** [@murtaza](https://ask.igwn.org/u/murtaza)\ **Replies:** 1\ **Last updated:** [August 11, 2024, 4:13pm UTC](https://ask.igwn.org/t/complete-versions-of-software-or-platforms-used-for-real-research/1085 "2024-08-11T16:13:15Z")
Hi I watched the tutorials (almost all workshops from the begining till date) also read many related research papers and got an overview and now have a question, the software packages and the platforms explained here in… --- ## [Linux change of distribution problem, kindly guide](https://ask.igwn.org/t/linux-change-of-distribution-problem-kindly-guide/1087)
**Author:** [@murtaza](https://ask.igwn.org/u/murtaza)\ **Replies:** 1\ **Last updated:** [August 11, 2024, 4:10pm UTC](https://ask.igwn.org/t/linux-change-of-distribution-problem-kindly-guide/1087 "2024-08-11T16:10:19Z")
C:\\Users\\DELL\>wsl --install -d Debian Catastrophic failure Error code: Wsl/InstallDistro/E\_UNEXPECTED --- ## [Ligo detector signal calibration](https://ask.igwn.org/t/ligo-detector-signal-calibration/1071)
**Author:** [@mjy](https://ask.igwn.org/u/mjy)\ **Replies:** 5\ **Last updated:** [August 9, 2024, 4:15am UTC](https://ask.igwn.org/t/ligo-detector-signal-calibration/1071 "2024-08-09T04:15:31Z")
What is the cause for large relative signal strength fluctuations between L1 and H1, of +/- 20%? --- ## [How to Obtain and Read GW Data in SFDB File Format](https://ask.igwn.org/t/how-to-obtain-and-read-gw-data-in-sfdb-file-format/1073)
**Author:** [@CKS](https://ask.igwn.org/u/CKS)\ **Replies:** 2\ **Last updated:** [July 10, 2024, 10:23am UTC](https://ask.igwn.org/t/how-to-obtain-and-read-gw-data-in-sfdb-file-format/1073 "2024-07-10T10:23:04Z")
Hi everyone, I’m looking for help on how to get GW data in the SFDB file format and how to read this format. Any advice or useful links on learning more about SFDB would be greatly appreciated! Thanks! --- ## [Need an assiantance in finding research proposal](https://ask.igwn.org/t/need-an-assiantance-in-finding-research-proposal/1068)
**Author:** [@Rao](https://ask.igwn.org/u/Rao)\ **Replies:** 1\ **Last updated:** [July 5, 2024, 5:07am UTC](https://ask.igwn.org/t/need-an-assiantance-in-finding-research-proposal/1068 "2024-07-05T05:07:12Z")
Hi all, I’m a PhD scholar who has completed the one-year coursework and is currently in the process of developing a research proposal. Initially, my supervisor assigned me work on Gamma-Ray Bursts (GRBs). However, I exp… --- ## [Zavaró frekvencia jeleket kísérő fluktuációi](https://ask.igwn.org/t/zavaro-frekvencia-jeleket-kisero-fluktuacioi/1065)
**Author:** [@Soltere11](https://ask.igwn.org/u/Soltere11)\ **Replies:** 0\ **Last updated:** [June 25, 2024, 6:41pm UTC](https://ask.igwn.org/t/zavaro-frekvencia-jeleket-kisero-fluktuacioi/1065 "2024-06-25T18:41:44Z")
Üdvözlöm önöket. Kerepeczki Zsolt vagyok. A hobbim a Gravitációs hullám csillagászat. Több mint tíz éve foglalkozom fizikával minden nap és négy éve a Gravity Sry spektogram képeit elemzem, ez idő alatt számtalan új hiba… --- ## [Redshift derivation](https://ask.igwn.org/t/redshift-derivation/1058)
**Author:** [@Dyslaia](https://ask.igwn.org/u/Dyslaia)\ **Replies:** 1\ **Last updated:** [June 11, 2024, 2:45am UTC](https://ask.igwn.org/t/redshift-derivation/1058 "2024-06-11T02:45:59Z")
Hello everyone! My classmate and I are working on a project right now in which we use GWs data. We did our research through papers and different websites in order to understand well this topic: redshift derivation. Can … --- ## [About code of python](https://ask.igwn.org/t/about-code-of-python/1054)
**Author:** [@khyati](https://ask.igwn.org/u/khyati)\ **Replies:** 1\ **Last updated:** [May 30, 2024, 3:56pm UTC](https://ask.igwn.org/t/about-code-of-python/1054 "2024-05-30T15:56:50Z")
why o2, o3 not running in the below code: from gwosc.datasets import run\_segment print(run\_segment(‘O1’)) --- ## [Choice of PSD for SNR](https://ask.igwn.org/t/choice-of-psd-for-snr/1043)
**Author:** [@yidelee](https://ask.igwn.org/u/yidelee)\ **Replies:** 2\ **Last updated:** [May 27, 2024, 2:00pm UTC](https://ask.igwn.org/t/choice-of-psd-for-snr/1043 "2024-05-27T14:00:26Z")
Dear colleagues, I would like to ask which PSD shall I use when calculating SNR. Currently I came up with two possible methods: When calculating the SNR between original template and raw data, use the PSD from raw no… --- ## [Choice of PSD for whiten](https://ask.igwn.org/t/choice-of-psd-for-whiten/1042)
**Author:** [@yidelee](https://ask.igwn.org/u/yidelee)\ **Replies:** 2\ **Last updated:** [May 27, 2024, 1:50pm UTC](https://ask.igwn.org/t/choice-of-psd-for-whiten/1042 "2024-05-27T13:50:21Z")
Dear colleagues, I would like to ask which PSD shall I use for whiten process. Before stating my question, I would like to explain my whitening process: apply a tukey window to the signal so that the boundaries meet, t… --- ## [Where can I obtain the recorded data of GWs and corresponding best-matched templates for all the published events of binary mergers confirmed by LVC please?](https://ask.igwn.org/t/where-can-i-obtain-the-recorded-data-of-gws-and-corresponding-best-matched-templates-for-all-the-published-events-of-binary-mergers-confirmed-by-lvc-please/1027)
**Author:** [@Wein](https://ask.igwn.org/u/Wein)\ **Replies:** 1\ **Last updated:** [May 13, 2024, 2:56am UTC](https://ask.igwn.org/t/where-can-i-obtain-the-recorded-data-of-gws-and-corresponding-best-matched-templates-for-all-the-published-events-of-binary-mergers-confirmed-by-lvc-please/1027 "2024-05-13T02:56:49Z")
Thank you for your helps. It is known that the LIGO-Virgo Collaboration (LVC) has released over 100 confirmed GW events. For each event, I believe that they possess the recorded raw data, which is a one-dimensional sequ… --- ## [Signal Visibility Reduction in Spectrograms Following Whitening Process (PyCBC)](https://ask.igwn.org/t/signal-visibility-reduction-in-spectrograms-following-whitening-process-pycbc/1021)
**Author:** [@Elahe](https://ask.igwn.org/u/Elahe)\ **Replies:** 4\ **Last updated:** [May 8, 2024, 1:21am UTC](https://ask.igwn.org/t/signal-visibility-reduction-in-spectrograms-following-whitening-process-pycbc/1021 "2024-05-08T01:21:42Z")
Dear all, I am currently using PyCBC to simulate gravitational wave data and have encountered an output related to spectrogram that I would like to better understand. Enclosed are three spectrogram images for your peru… --- ## [Q-transform of simulated waveform is sensitive to discontinuities](https://ask.igwn.org/t/q-transform-of-simulated-waveform-is-sensitive-to-discontinuities/1006)
**Author:** [@yidelee](https://ask.igwn.org/u/yidelee)\ **Replies:** 2\ **Last updated:** [April 21, 2024, 3:17am UTC](https://ask.igwn.org/t/q-transform-of-simulated-waveform-is-sensitive-to-discontinuities/1006 "2024-04-21T03:17:40Z")
Dear colleagues, I applied the q-transform using TimeSeries.q\_transform() in gwpy of pure noises, mixed noises and templates, and pure templates. Pure noises were obtained from TimeSeries.fetch\_open\_data() in gwpy, and… --- ## [Difference between PSD from aLIGOZeroDetHighPower and real data](https://ask.igwn.org/t/difference-between-psd-from-aligozerodethighpower-and-real-data/1007)
**Author:** [@yidelee](https://ask.igwn.org/u/yidelee)\ **Replies:** 2\ **Last updated:** [April 21, 2024, 3:04am UTC](https://ask.igwn.org/t/difference-between-psd-from-aligozerodethighpower-and-real-data/1007 "2024-04-21T03:04:46Z")
Dear colleagues, The attached figure is a comparison of PSDs. The blue one was generated from aLIGOZeroDetHighPower in pycbc.psd. The orange one is the averaged energy spectrum density (np.abs(rfft(data))\*\*2) from multi… --- ## [List of Most Recent Events](https://ask.igwn.org/t/list-of-most-recent-events/938)
**Author:** [@medicrene](https://ask.igwn.org/u/medicrene)\ **Replies:** 1\ **Last updated:** [April 8, 2024, 11:45pm UTC](https://ask.igwn.org/t/list-of-most-recent-events/938 "2024-04-08T23:45:37Z")
In my review of the LIGO website and data, the LIGO claims that they get a gravitational wave even about once a week. The catalog of events that I have accessed does not nearly so many events and I have not found any ev… --- ## [Seeking Assistance with Numerical Solution of Spin-up Equation](https://ask.igwn.org/t/seeking-assistance-with-numerical-solution-of-spin-up-equation/905)
**Author:** [@CKS](https://ask.igwn.org/u/CKS)\ **Replies:** 2\ **Last updated:** [March 26, 2024, 7:28pm UTC](https://ask.igwn.org/t/seeking-assistance-with-numerical-solution-of-spin-up-equation/905 "2024-03-26T19:28:02Z")
Hello Everyone, I’m trying to solve the following spin-up equation df/dt = C\_GW\*f^{11/3} numerically. I’m solving this equation using numerical methods, but my results don’t match with what I expect based on the analytic… --- ## [find glitches stand on nan data segements](https://ask.igwn.org/t/find-glitches-stand-on-nan-data-segements/893)
**Author:** [@Shealylzu](https://ask.igwn.org/u/Shealylzu)\ **Replies:** 1\ **Last updated:** [March 25, 2024, 5:22pm UTC](https://ask.igwn.org/t/find-glitches-stand-on-nan-data-segements/893 "2024-03-25T17:22:29Z")
Hi, I’m recently using machaine learning to deal with glitch classification, which need to obtain glitch time series data. So, I do the following steps, download the csv file ‘trainingset\_v1d1\_metadata.csv’ (only 5.12… --- ## [Encountering errors while installing the pyfstat in vs code](https://ask.igwn.org/t/encountering-errors-while-installing-the-pyfstat-in-vs-code/885)
**Author:** [@CKS](https://ask.igwn.org/u/CKS)\ **Replies:** 11\ **Last updated:** [February 26, 2024, 6:17pm UTC](https://ask.igwn.org/t/encountering-errors-while-installing-the-pyfstat-in-vs-code/885 "2024-02-26T18:17:10Z")
Hello Everyone, has anyone installed PyFstat module in vs code? I am encountering erros while trying to install this module. So, I’m looking for suggestions. Here is the error message; × Preparing metadata (pyproject.t… --- ## [Simulated Data Source Location](https://ask.igwn.org/t/simulated-data-source-location/876)
**Author:** [@Lizzie](https://ask.igwn.org/u/Lizzie)\ **Replies:** 6\ **Last updated:** [February 7, 2024, 11:30pm UTC](https://ask.igwn.org/t/simulated-data-source-location/876 "2024-02-07T23:30:28Z")
Hi everyone, I’m currently using BayesWave for analysis of simulated supernova gravitational waveforms and am wondering how I add a source location to the simulated data? I am not sure whether this is something I do thr… --- ## [New data available: O3 auxiliary channels](https://ask.igwn.org/t/new-data-available-o3-auxiliary-channels/880)
**Author:** [@jonah](https://ask.igwn.org/u/jonah)\ **Replies:** 0\ **Last updated:** [February 6, 2024, 7:46pm UTC](https://ask.igwn.org/t/new-data-available-o3-auxiliary-channels/880 "2024-02-06T19:46:45Z")
We’ve released 16 additional channels from O3 ! Researchers at IAS made a request for some additional O3 data, and we’ve made these data available. The data release is intended to support studies of noise cleaning metho… --- ## [Simulated observation of gravitational wave data](https://ask.igwn.org/t/simulated-observation-of-gravitational-wave-data/530)
**Author:** [@sty](https://ask.igwn.org/u/sty)\ **Replies:** 2\ **Last updated:** [February 2, 2024, 7:32am UTC](https://ask.igwn.org/t/simulated-observation-of-gravitational-wave-data/530 "2024-02-02T07:32:09Z")
I want to simulate a section of gravitational wave data containing noise. Based on literature and tutorials, my understanding is to simulate noise and gravitational wave signals separately, and add them in the time domai… --- ## [Looking for collaboration](https://ask.igwn.org/t/looking-for-collaboration/877)
**Author:** [@sanjeev7881](https://ask.igwn.org/u/sanjeev7881)\ **Replies:** 0\ **Last updated:** [February 2, 2024, 7:00am UTC](https://ask.igwn.org/t/looking-for-collaboration/877 "2024-02-02T07:00:02Z")
To All Members I hope you are doing well as I write this. My name is Sanjeev, I’m reaching out to express my enthusiasm for the fantastic work happening within our community, and I am eager to propose a collaborative ef… --- ## [Regarding choosing specific waveform approximantion](https://ask.igwn.org/t/regarding-choosing-specific-waveform-approximantion/841)
**Author:** [@sanjeev7881](https://ask.igwn.org/u/sanjeev7881)\ **Replies:** 8\ **Last updated:** [January 4, 2024, 12:43am UTC](https://ask.igwn.org/t/regarding-choosing-specific-waveform-approximantion/841 "2024-01-04T00:43:02Z")
Hi there, I have seen that there are a total of 72 wave approximations. How can one choose a particular wave approximation for a specific event? Suppose the observed wave event is a binary black hole (BBH); how do we de… --- ## [Criteria for the events that are listed in event portal](https://ask.igwn.org/t/criteria-for-the-events-that-are-listed-in-event-portal/864)
**Author:** [@Maryam](https://ask.igwn.org/u/Maryam)\ **Replies:** 1\ **Last updated:** [December 22, 2023, 7:39pm UTC](https://ask.igwn.org/t/criteria-for-the-events-that-are-listed-in-event-portal/864 "2023-12-22T19:39:09Z")
Hi, Number of (super)events that are listed in GraceDB during O3ab is significantly larger than the events that are actually listed in event portal (the reduction factor is enormous). I understand that some of the (supe… --- ## [Frames and Channel names for O4 analysis](https://ask.igwn.org/t/frames-and-channel-names-for-o4-analysis/863)
**Author:** [@Alvin](https://ask.igwn.org/u/Alvin)\ **Replies:** 1\ **Last updated:** [December 21, 2023, 11:07pm UTC](https://ask.igwn.org/t/frames-and-channel-names-for-o4-analysis/863 "2023-12-21T23:07:33Z")
Hi, I am trying to go through the LIGO wiki page DiscoveryService \< Main \< LIGOWiki and I would like to ask what is the difference (in terms of the data) between “AR” frames and normal frames? Which frame type should I … [Previous page](https://ask.igwn.org/c/data-analysis/6.md?page=1) [Next page](https://ask.igwn.org/c/data-analysis/6.md?page=3)