If I understand your question correctly, the syntax is:
response ~ primary1 + primary2 + ... + primaryn |
grouping1/grouping2/.../groupingm
where there are n primary covariates and m grouping levels.
ap
----------------------------------------------------------------------
Andrew J Perrin - http://www.unc.edu/~aperrin
Assistant Professor of Sociology, U of North Carolina, Chapel Hill
clists@perrin.socsci.unc.edu * andrew_perrin (at) unc.edu
On Sat, 24 Aug 2002, Nathan Leon Pace, MD, MStat wrote:
> In the non linear mixed effects package a groupedData object can be
> created to facilitate modeling.
>
> The gD object includes a formula of the form 'response variable' ~
> 'primary covariate' | 'grouping factor'.
>
> In experiments creating response surfaces there are 2 or more primary
> covariates.
>
> Is there any way to use the groupedData() function to include 2 primary
> covariates?
>
> Thanks
>
> --
> Nathan Leon Pace, MD, MStat Work:nlpace@bigpace.med.utah.ed
> Department of Anesthesiology Play:nlpaces@attbi.com
> University of Utah Voice Work:801.581.6393 Play:801.467.2925
> Salt Lake City, Utah Fax Work:801.581.4367 Play:801.467.0555
>
>
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