bootMerCases: bootMerCases
In jflournoy/permediatr:

bootMerCases

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bootMerCases(x, FUN, nsim = 1, seed = NULL, how = c("groups",
  "within", "both"), parallel = c("no", "multicore"),
  ncpus = getOption("boot.ncpus", 1L))

`x`	a fitted `merMod` object: see `lmer`, `glmer`, etc.
`FUN`	a function taking a fitted `merMod` object as input and returning the statistic of interest, which must be a (possibly named) numeric vector.
`nsim`	number of resampled data sets, positive integer; the bootstrap B (or R).
`seed`	optional argument to `set.seed`.
`how`	Character specifying whether resampling should be done of groups, observations within groups, or both. Currently only one level of grouping is allowed.
`parallel`	The type of parallel operation to be used (if any).
`ncpus`	integer: number of processes to be used in parallel operation: typically one would choose this to be the number of available CPUs.