"is there a way to set either the within group error to a specific, fixed
value that does not change during the optimization (0 is one possibility
but other values as well) or to set arbitrary elements of the between
groups random effect covariance matrix to specific, fixed values."
I asked this question a while back and the author says no.
--Naomi Altman
At 10:48 AM 4/17/2003 -0700, Mike Stoolmiller wrote:
I have some questions for the lme experts out there. First, in a two
level model for example, is there a way to set either the within group
error to a specific, fixed value that does not change during the
optimization (0 is one possibility but other values as well) or to set
arbitrary elements of the between groups random effect covariance matrix
to specific, fixed values. Second, is there a way to estimate models that
have no between group random effects but only the within group random
effects? Any help would be greatly appreciated.
Mike Stoolmiller
"Darkness cannot drive out darkness, only light can do that. Hate cannot
drive out hate, only love can do that."
Dr. Martin Luther King, Jr.
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Naomi S. Altman 814-865-3791 (voice)
Associate Professor
Dept. of Statistics 814-863-7114 (fax)
Penn State University 814-865-1348 (Statistics)
University Park, PA 16802-2111
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