Different results with paired t-test and ANOVA post-hoc paired t-test
Dear Team,
I recently tried to reproduce some analyses my professor conducted in SPSS. I could reproduce the ANOVA, however the post-hoc paired t-tests gave minimally different results. I then reproduced the post-hoc t-tests in R, which gives identical results to SPSS. After further experimentation I noticed that also the t-test function in JASP gives the same results as SPSS/R.
Therefore, I´d like to know how the calculation of the paired t-tests in JASP is different when using the t-test function compared to doing ANOVA post-hoc t-tests.
The differences are quite small, but noticable, for example t = 27.28 vs t = 27.35.
Best,
Max
Comments
Hi Max,
Can you include your data example perhaps? That way I can zoom in on the problem, but I can also take some guesses:
Kind regards,
Johnny
Hi Johnny,
thank you very much for the offer. Unfortunately, we cannot share the .jasp file on the forum because it is too big. Do you have an Email address we can send a filesender message to?
1) It is a RM ANOVA. I tried out whether pooling the error term accounts for the difference, it does not.
2) The design is balanced.
3)There is no missing data.
Best,
Max