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grouping
2002 Aug 24
1
nlme
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