On Tue, Jan 24, 2012 at 6:19 PM, Mohd masood <masood0...@rediffmail.com> wrote:
>
> Dear All
> I am trying to include sampling weights in multilavel regression analysis
> using packege lme4 using following codes
>
> print(fm1 <- lmer(DC~sex+age+smoker+alcohol+fruits(1|setting),
> dataset,REML = FALSE), corr = FALSE)
> print(fm2 <- lmer(DC~sex+age+smoker+alcohol+fruits(1|setting),
> dataset,REML = FALSE), corr = FALSE,weights=sweight)
> The problem is both the codes giving me exactly the same results.is
> this "weights" not meant for sampling weights?if not, how can i include
> sampling weights in lme4?
It's not meant for sampling weights. It's meant for precision
weights. How best to include sampling weights in mixed models is a
research problem at the moment, but you can rely on getting the wrong
answer if you just use the weights= argument.
-thomas
--
Thomas Lumley
Professor of Biostatistics
University of Auckland
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