Incorrect degrees of freedom for Welch's independent t-test [JASP 0.10]

[sinisalakic]

First of all, very enthusiastic about the new version! Thanks for the hard work guys!

• JASP version: 0.10
• OS name and version: OSX 10.13.6
• Analysis: Independent samples t-test
• Bug description: When computing Welch's t-test if one selects Confidence interval for standardized Effect size one doesn't get the corrected number of degrees of freedom (when subsamples differ in size and variability), but copied dfs from the regular Student's test 😮 .

Without selecting CIs, one obtains the corrected values which should be the case.

[sinisasub]

I can verify that the same exact issue exists on the Windows version. It appears to be a new bug, I tested it on 0.9.1.0 and it works fine there. A minor bug, but something to be addressed nevertheless. Keep up the good work guys!

[AlexanderLyNL]

Thank you both for figuring this out! We'll fix this.

[JohnnyDoorn]

Thanks for reporting, I fixed it and it will be in the next release.

[AlexanderLyNL]

I did this (on my own branch) by removing the following line:

https://github.com/jasp-stats/jasp-desktop/blob/e5649a374b7753d56930b82bd007ec0d55757262/JASP-Engine/JASP/R/ttestindependentsamples.R#L351

[JohnnyDoorn]

Yes, let's discuss this in person (because what you did implies something different from what I did)

…

On Mon, 17 Jun 2019 at 15:14, AlexanderLyNL ***@***.***> wrote: I did this (on my own branch) by removing the following line: https://github.com/jasp-stats/jasp-desktop/blob/e5649a374b7753d56930b82bd007ec0d55757262/JASP-Engine/JASP/R/ttestindependentsamples.R#L351 — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#386?email_source=notifications&email_token=ADX2BC372T7X4YYIVHLLHCTP26E2DA5CNFSM4HX3W2UKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODX3D4TQ#issuecomment-502677070>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADX2BCZ4GWYYZ7KUMIJ6AY3P26E2DANCNFSM4HX3W2UA> .