Re: [R] how to specify two variance effects in gls

I got the answer: weights=varComb(varFixed(~1/n),varPower(~Age)) Bond, Stephen-2 wrote: Hello everybody, I have a dataset where each row has number of subjects and that gives me natural weights for the variance function. Additionally I see that variance increases with Age, which is a

[R] how to specify two variance effects in gls

Hello everybody, I have a dataset where each row has number of subjects and that gives me natural weights for the variance function. Additionally I see that variance increases with Age, which is a regressor. So using gls I have weights=varFixed(~1/n) but don't know how to include the extra