Hi there,
>
> I am using the function pgls in the CAPER package, everything seems to run
> fine except for one of my variables.
> When using this variable as continuous the anova works without problem,
> but if using the same variable as factor (in fact, this is what it is), the
> program returns this answer:
>
> Error in terms.formula(formula, data = data) :
> invalid model formula in ExtractVars
>
>
> any ideas on what might be the problem?
>
> Cheers!
>
>
>
> --
> BAS
>
>
>
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