Nothing
if (lme4:::testLevel() > 1 || .Platform$OS.type!="windows") {
## example posted by Stéphane Laurent
## exercises bug where Nelder-Mead min objective function value was >0
set.seed(666)
sims <- function(I, J, sigmab0, sigmaw0){
Mu <- rnorm(I, mean=0, sd=sigmab0)
y <- c(sapply(Mu, function(mu) rnorm(J, mu, sigmaw0)))
data.frame(y=y, group=gl(I,J))
}
I <- 3 # number of groups
J <- 8 # number of repeats per group
sigmab0 <- 0.15 # between standard deviation
sigmaw0 <- 0.15 # within standard deviation
dat <- sims(I, J, sigmab0, sigmaw0)
library(lme4)
isOldTol <- environment(nloptwrap)$defaultControl$xtol_abs == 1e-6
fm3 <- lmer(y ~ (1|group), data=dat)
stopifnot(all.equal(unname(unlist(VarCorr(fm3))),
switch(fm3@optinfo$optimizer,
"Nelder_Mead" = 0.029662844,
"bobyqa" = 0.029662698,
"nloptwrap" =
if (isOldTol) 0.029679755 else 0.029662699,
stop("need new case here: value is ",unname(unlist(VarCorr(fm3))))
),
tolerance = 1e-7))
} ## skip on windows (for speed)
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