Power analysis for multiple regression question

Hi All,

I am setting up research design using multiple regression in developmental psychology context, using:

2 predictors where each can be divided into 3 components and a total score

2 outcome variables

With regard to the power analysis I am not sure how many predictors I should consider myself to have

I also do not know how to estimate what the R2 or anticipated effect size might be.

Any insight someone may offer would be appreciated - my aim is to know how many participants I need.

Best regards,


Ninja say what!?!
Have you tried looking up power calculations on google? There are some good sites out there that will teach you how to calculate the subjects you need in order to have enough power.