How can I conduct a Sample size estimation for Hayes Model 8?

22 March 2023 1 9K Report

Hi everyone,

For my master thesis I will conduct a mediated moderation and will thus use Hayes PROCESS model 8 (See attachment). I am currently stuck, however, at trying to compute the estimated sample size. Is this possible with G*Power? And if so, how? (FYI I'm not familiar with R unfortunately)

Thank you so much for your help in advance!

Christian Geiser

It could be done in G*Power by considering two separate multiple regression models with interaction terms (W*X), one regression model for M and one for Y. Those regression models would have to be looked at separately. You can also study change in R-squared when the interaction term W*X is added to each model.

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