[R] how to specify two variance effects in gls
stephenb
stenka1 at go.com
Thu Aug 20 15:02:29 CEST 2009
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 regressor.
> So using gls I have
>
>
>
> weights=varFixed(~1/n)
>
> but don't know how to include the extra effect of the regressor.
> Fitted values show a quadratic curve vs. age, not sure if that helps.
>
> Thanks everybody.
> Stephen
>
> [[alternative HTML version deleted]]
>
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