isTtestRandomGroups: Create random group memberships for independent samples...
In tdeenes/eegR: Analyze EEG Signals

Description Usage Arguments Value Examples

This function creates a random permutation of the original group memberships for independent samples t-tests. Care is taken so that all permutations are unique.

1	isTtestRandomGroups(obj, nperm, seed = NULL)

`obj`	a list object returned by `preTtest`; the `obj$groups` element is relevant indicating the original group memberships
`nperm`	integer indicating the number of permutations
`seed`	an integer value which specifies a seed (default: NULL), or a list of arguments passed to `set.seed`

isTtestRandomGroups returns a matrix with as many rows as the length of 'group' and as many columns as 'nperm'.

## Not run: 
# this should fail: too many permutations on a small sample
temp <- try(isTtestRandomGroups(list(groups = rep(1:2, each = 4L), 1e3)), 
            silent = TRUE)
stopifnot(inherits(temp, "try-error"))

# all permutations should be unique
temp <- isTtestRandomGroups(list(groups = rep(1:2, c(6, 4))), 500)
stopifnot(!anyDuplicated(temp, MARGIN = 2L))
temp <- isTtestRandomGroups(list(groups = rep(1:2, each = 20L)), 1e4)
stopifnot(!anyDuplicated(temp, MARGIN = 2L))

## End(Not run)