Hi, Prof. Bates,
It appears the weights argument is ignored in lmer but not in lmer2.
See, for example:
library(lme4)
set.seed(1)
w <- abs(rnorm(nrow(sleepstudy)))
fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy)
fm2 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy, weights = w)
fm3 <- lmer2(Reaction ~ Days + (Days|Subject), sleepstudy, weights = w)
VarCorr(fm1) # no weights
VarCorr(fm2) # same as fm1, incorrect
VarCorr(fm3) # `w' applied correctly
sessionInfo()
R version 2.5.1 (2007-06-27)
i386-pc-mingw32
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] "stats" "graphics" "grDevices" "utils" "datasets" "methods"
[7] "base"
other attached packages:
lme4 Matrix lattice
"0.99875-6" "0.999375-0" "0.16-2"