Hi,
We conducted a small preliminary research that included a multiple linear regression model. Then I tried to calculate its power using an online post-hoc power calculator for multiple regerssion (https://www.danielsoper.com/statcalc/calculator.aspx?id=9)
When entering our data in the calculator (no. of predictors = 2, R2= 0.504, alpha=0.05 and number of subjects=25), I got a statistical power of 0.991. I'm quite surprised with that value, as it seems too large for me, especially with the relative small sample size.
Am I doing anything wrong, or is that value is correct and possible?
Thanks,
Uri,