r - update on merMod object gives different fit -


i trying refit full model of class mermod intercept (the null model). however, refitting using update.mermod gives different answer fitting null model hand, e.g.:

# generate random data set.seed(9)  dat <- data.frame(   x = do.call(c, lapply(1:5, function(x) rnorm(100, x))),   random = letters[1:5] )  dat$y = rnbinom(500, mu = exp(dat$x), size = 1)  library(lme4)  # full model full <- glmer.nb(y ~ x + (1 | random), dat)  # write out intercept-only model hand null <- glmer.nb(y ~ 1 + (1 | random), dat)  # update  null2 <- update(full, . ~ 1 -. + (1 | random))  varcorr(null)  varcorr(null2)

any idea why how can use update same vcov matrix?


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