isNested: Is f1 nested within f2?

In reformulas: Machinery for Processing Random Effect Formulas

Is f1 nested within f2?

Description

Does every level of f1 occur in conjunction with exactly one level of f2? The function is based on converting a triplet sparse matrix to a compressed column-oriented form in which the nesting can be quickly evaluated.

Usage

isNested(f1, f2)

Arguments

f1	factor 1
f2	factor 2

Value

TRUE if factor 1 is nested within factor 2

Examples

if (requireNamespace("lme4")) {
   data("Pastes", package = "lme4")
   with(Pastes, isNested(cask, batch))   ## => FALSE
   with(Pastes, isNested(sample, batch))  ## => TRUE
}

reformulas documentation built on Nov. 3, 2024, 9:07 a.m.