???
correlated within group errors are explicitly modeled by corStruct classes.
See ?lme and Chapter 5.3 in Bates and Pinheiro.
-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
"The business of the statistician is to catalyze the scientific learning
process." - George E. P. Box
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Na Li
> Sent: Friday, January 14, 2005 8:42 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] empirical (sandwich) SE estimate in lme ()?
>
>
> Is it possible to get the empirical (sandwich) S.E. estimates for the
> fixed effects in lme () (thus allowing possibly correlated
> errors within
> the group)? In SAS you can get it by the 'empirical' option
> to PROC MIXED.
>
> Cheers,
>
> Michael
>
> --
> Na (Michael) Li, Ph.D.
> Division of Biostatistics A443 Mayo Building, MMC 303
> School of Public Health 420 Delaware St SE
> University of Minnesota Minneapolis, MN 55455
> Phone: (612) 626-4765 Email: nali at umn.edu
>
> Fax: (612) 626-0660 http://www.biostat.umn.edu/~nali
>
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