Help!

[Metz]

Hi! I have a question: how can i 'translate' this RStudio command

     > fm9.1<-gls(visual~-1+visual0+time.f+treat.f:time.f, weights=varIdent(form=~1|time.f),data=armd)

     > summary(fm9.1)

in SAS code?

I can't solve this problem. Thanks for your help!

[Reeza]

What is the code above doing?

[Metz]

It's a regression with heterogeneus variance:  visual= visual0 timef timef*treatf  without intercept, where timef and treat are factors. Based on generalize least squares (weighted in particular), where the 'w_i' is not equal 1, as usual, but it's equal to  the variance of the first level of timef. How can i write this?