Effect-size ANOVA equation

Question

Dear

Firstly, I congratulate the initiative on facilitating the analysis of the data through the website. 

I want to analyze the size of the effect through the link site https://webpower.psychstat.org/models/means03/effectsize.php

Could you offer information on the equation applied in the link?

 

Sincerely

Answer 1

The information can be found in the manual here: https://webpower.psychstat.org/wiki/_media/grant/webpower_manual_book.pdf