Following my question here, I am also looking at the difference between males and females and I have conducted linear regression in a general linear model setup for this purpose.
My effect size for this part of the project is $\eta^2$ (which is 0.25).
$\eta^2$ is equivalent to $R^2$ (which is the appeal for me in this case).
I am wondering how do I calculate the confidence interval of $\eta^2$. Does anyone know of any online calculators that can I can use?