How is d from paired t-test calculated?

Discuss the jamovi platform, possible improvements, etc.

by RickCarlsson » Tue Apr 09, 2019 6:38 pm

First: Amazing job. Jamovi is absolutely fantastic. We are retiring SPSS department wide.

Now to my question: How is d calculated for paired sampe t-tests? There are several ways and knowing which is important.

In general it would, especially for teaching, be great to learn the mathematical formula behind different tests. Is there some simple way to access that? It’s not detailed in the R package.
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by jonathon » Wed Apr 10, 2019 12:57 am

hi rick,

great you guys are able to move beyond spss.

at present, the easiest way is to dive into the scripts underlying each analysis. here's the relevant section for cohen's d for the paired samples t-test:

https://github.com/jamovi/jmv/blob/mast ... .R#L54-L66

longer term we want to provide good documentation of course.

with thanks

jonathon
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by RickCarlsson » Thu Apr 11, 2019 6:28 pm

This works for me :) Thanks!
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