I have a categorical variable with three levels
Cu Cu000 Cu000 Cu035 Cu175 Cu000 Cu175 Cu035 . . .
The exact distribution of the three values (Cu000, Cu035, Cu175) is as shown below.
Cu000 Cu035 Cu175 251 275 263
I know that if the variable is binary then variance is p*(1-p), not sure how do I estimate the variance within a 3 level categorical variable? Any suggestion is apricated thanks.