Different results in correltional tractography depending on filter on longitudinal database

[Ellen Nogossek]

Dear Frank, 

I am currently comparing the QA in two groups (control and ballett) and two points of assesment (scan1 and scan2) in the correlational tractography. Unfortunately I get different results, wheather I use a longitudinal database with no applied filter or the filter "study only incresed values in follow-up (scan2)". When testing without a filter, no significant decreases are found, if I interpret the name of this image "qa.group.r3.fdr0.05.dec" correctly:

If I test with the filter on the other hand, decreases can be found in this image :

In both analyses I used 10000 permutations and and effect size of .30. 

Thank you very much for your time!

best regards, 

Ellen Nogossek 

[Frank Yeh]

Based on what I'm seeing, it appears that the current results might not show a clear finding. This is often the case when examining the cerebellum, as variability from different slice cut-offs can sometimes lead to challenging or ambiguous results.

It's also possible that the effect size is quite modest here. If so, exploring a larger sample size could be a helpful approach to uncover more significant findings.

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