What effect size measure can be used for a goodness of fit test (given data and theoretical proportions)?
I read about the Cohen's w (https://en.wikipedia.org/wiki/Effect_size#Cohen's_w) but I also read (for example here https://rcompanion.org/handbook/H_03.html) that Cohen's w can be used only where the theoretical proportions are equally distributed among categories. Is it true, is it a strict bond or am I missing something? What other measure can be used?
Thanks