[R] Dealing with heterogeneity with varComb weights

[RS27]

Hi,
I am trying to add multiple variance structures such as the first example
below:

vf1 <- varComb(varIdent(form = ~1|Sex), varPower())

However my code below will not work can anybody please advise me?

VFcomb<-varComb(varExp(form=~depcptwithextybf),varFixed(form=~FebNAO))

also if you have two variables with the same weights function would you
write that as:

VFcomb<-varComb(varExp(form=~depcptwithextybf),varExp(form=~FebNAO))

thanks
Rebecca


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