"flag significant comparisons" option in the PostHoc section - can we trust it?(JASP)
I was wondering if after performing ANOVA in JASP, I can actually rely on the "flag significant comparisons" option in the PostHoc section or I need to manually adjust to my new adjusted p-value?
For example (image + data attached): I performed a behavioural test helping me to divide participants into 3 groups (controls, abnormal and normal). Then, I wanted to check their brain atrophy level as based on this division.
ANOVA is significant (p = 0.046), so I performed a PostHoc (I chose Bonferroni). There are 3 comparisons to make as I have 3 sub-groups of participants, so the new adjusted p-value for Bonferroni is = 0.05/3 = 0.016666 (this one is just manually calculated as I don't see it in JASP).
However, I chose the option "flag significant comparisons" and there is a Bonferroni result p = 0.048 which is indicated by JASP as significant. Still, if I make the above calculation manually where I got the new adjusted p = 0.016666, then this result of p = 0.048 should not actually be indicated as statistically significant.
Still, there is this beautiful note:"P-value adjusted for comparing for a family of 3"
So, is JASP somehow taking the new adjusted p -value and calculating it in a manner that is easy for us to understand and adjusting it to the initial alpha of 0.05 OR "the flag significant comparisons" has another meaning and we should not trust it , but unfortunately manually calculate the new adjusted p-value and make a case by case individual decisions?
Thank you and best wishes!