[R-sig-ME] Putz Z in lmer

[Ryan King]

I mentioned this off-list, but for some structures the INLA package
does allow this.  See their bone-density spline example.

On Sun, Aug 21, 2011 at 5:00 AM,
<r-sig-mixed-models-request at r-project.org> wrote:
> From: Douglas Bates <bates at stat.wisc.edu>
> To: Eder David Borges da Silva <eder at leg.ufpr.br>
> Cc: R-sig-mixed-models at r-project.org
> Subject: Re: [R-sig-ME] Putz Z in lmer
> Message-ID:
>        <CAO7JsnRRhpvQ5JyQSVHHw-=WCptwRxeSST5OeudC9S_bFhu+rQ at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Wed, Aug 17, 2011 at 3:09 PM, Eder David Borges da Silva
> <eder at leg.ufpr.br> wrote:
>> Dear group members
>> Imagine a mixed model y = Xb + Zu + e, Xb = fixed, random = Zu, is possible
>> in lme4: lmer declare the matrix of random effects for the adjustment??
>> Is there a function that allows to adjust this model stating the matrix Z and
>> X?
>
> Not directly and, even if you could, it would not be sufficient to
> specify Z - you also need to specify the form of the
> variance-covariance matrix of the random effects and how it is
> generated from the parameters to be optimized.
>
> We do plan to provide facilities to do this in a future release.
>
>
>
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