I am trying to estimate the sample size (power = 80; alpha = 0.05) required for a **multinomial logistic regression**.

The IV (*x*) is a dummy variable (0,1). The DV (*y*) is a nominal variable with 4 categories (0,1,2,3).

The hypothesis is that when *x* = 0, there would be an equal chance of observing any of the categories in *y* (i.e., .25 chance per category). And when *x* = 1, there will be a .60 chance of observing the specific category (0) in *y*.

The *wp* tutorial seems to speak only to binomial logistic regressions. Any guidance on how to determine a sample size will be much appreciated.