R Under development (unstable) (2023-07-03 r84633 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2023 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> ## DON'T load lme4; test is to see if glmer.nb works when
> ## lme4 is not loaded
> 
> set.seed(101)
> dd <- data.frame(x=runif(200), f= rep(1:20, each=10))
> b <- rnorm(20)
> dd <- transform(dd, y = rnbinom(200, mu  = exp(1 + 2*x + b[f]), size = 2))
> g <- lme4::glmer.nb(y~x + (1|f), data = dd)
> stopifnot(inherits(g, "glmerMod"))
> 
> proc.time()
   user  system elapsed 
   2.45    0.14    2.57