R help - Feb 2013 - CAPER pgls() anova not working with variable as factor

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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Hi Bianca

I have exactly the same problem! I see you posted this almost a year ago 
and didn't get any response.... Could you figure out what the problem was 
in the end? I am running a PGLS model with categorical factors. In one 
model the factor has two levels and the anova function works fine. In other 
I have more than two levels and it gives me the same problem you described 
below. The summary function works but the output breaks p-values down per 
level, and you don't get a p-value for the factor as a whole..

Any suggestions?. 

On Wednesday, February 6, 2013 12:09:31 PM UTC+2, Bianca A Santini
wrote:
>
> 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 
> > 
> > 
> > 
>
>         [[alternative HTML version deleted]] 
>
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