01 January 2019 4 10K Report

Hi again,

We conducted a study which was consisted of 6 repeated measures performed on a single group.We used repeated measures one-way ANOVA for that purpose, and received significant results, with an effect size of approximately 0.35.

Since we did not performed sample size calculation beforehand, we were asked by the reviewer to perform a post-hoc power analysis.

As far as I know (I might be totally wrong) - power analysis aims to verify that we avoid type II error, which is: there is a difference in the population, but we missed it (due to too small sample size, for example).

So, my question is - if we did find significance in our results, there is actually no chance that we will have type II error. This stands in line with the fact that power analysis calculators returns a power of 1.00. So- what's the point of doing it?

Thanks,

Uri.

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