Date: Wed, 26 Mar 2003 17:35:27 +0000 From: "Vumani Dlamini" <[EMAIL PROTECTED]> Subject: [R] Simple NLME problem (I hope) To: [EMAIL PROTECTED] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; format=flowed
"Vumani Dlamini" wrote: >Dear R-Users: >I would like to fit a multilevel model using LME such that the parameters >after fitting the multilevel in two separate groups and when I use the >complete data (with interactions between the grouping variable and the other >variables) set are comparable (or the same). >The problem I am having currently is that I am not sure whether it is >possible to let the random error term to vary by group such that the models >are comparable. At present only one random error term is estimate and this >"sort of" distorts the parameter estimates for the fixed and other random >effects. >Looking forward to your help. It may be that you want to use the "weights=varIdent(form=~1|groups)" argument which will fit a variance for each level of the groups factor. -- Ross Darnell School of Health and Rehabilitation Sciences University of Queensland, Brisbane QLD 4067 AUSTRALIA Email: <[EMAIL PROTECTED]> Phone +61 7 3365 6087 http://www.uq.edu.au/~uqrdarne/ ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
