Get the number of groups which show invariance with each of the groups

Get the number of groups which show invariance with each of the groups

Usage

nInvariant(
  fit,
  sort = F,
  fit.index = "cfi",
  cutoff = 0.01,
  drop = NA,
  df = FALSE
)

Arguments

fit

Output of incrementalFit.

sort

Logical. Should the results be sorted?

fit.index

Character. What measure should be used?

cutoff

The cutoff of the difference in `fit.index` to decide whether invariance holds.

drop

Character list of the groups that should be excluded from calculations.

df

Logical, if the data.frame of the comparison tree should be returned. If TRUE, `sort` and `drop` are ignored.

Value

If df = FALSE, returns a data frame with two columns: group name and the number of groups with invariant parameters. IF df = TRUE, calculates the number of gorups iteratively, by dropping the least invariant group at each iteration until there are 2 groups left. Returns a data frame with N-1 columns, where N is number of groups.