R help - Oct 2006 - correlation structure in lme without random effect

I was hoping to fit along the lines of

g<-gl(20,5)
y<-runif(100)
fit<-lme(fixed=y~g,correlation=corAR1(0,~1|g))

But I get the error "Incompatible formulas for groups in "random"
and
"correlation""

Any help would be greatly appreciated.
Ben

You haven't specified a random equation.  Try:

fit<-lme(fixed=y~g,random=~1|g,correlation=corAR1(0,~1|g))


On 30/10/06, Benjamin Tyner <btyner at stat.purdue.edu>
wrote:
> I was hoping to fit along the lines of
>
> g<-gl(20,5)
> y<-runif(100)
> fit<-lme(fixed=y~g,correlation=corAR1(0,~1|g))
>
> But I get the error "Incompatible formulas for groups in
"random" and
> "correlation""
>
> Any help would be greatly appreciated.
> Ben
>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
================================David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP

On 10/30/06, Benjamin Tyner <btyner at stat.purdue.edu>
wrote:
> I was hoping to fit along the lines of
>
> g<-gl(20,5)
> y<-runif(100)
> fit<-lme(fixed=y~g,correlation=corAR1(0,~1|g))
>
> But I get the error "Incompatible formulas for groups in
"random" and
> "correlation""
Use the gls function in the nlme package to fit a model with
correlation but no random effects specification.

Thanks!

Douglas Bates wrote:
> On 10/30/06, Benjamin Tyner <btyner at stat.purdue.edu> wrote:
>> I was hoping to fit along the lines of
>>
>> g<-gl(20,5)
>> y<-runif(100)
>> fit<-lme(fixed=y~g,correlation=corAR1(0,~1|g))
>>
>> But I get the error "Incompatible formulas for groups in
"random" and
>> "correlation""
>
> Use the gls function in the nlme package to fit a model with
> correlation but no random effects specification.