Omit terms separated by vertical bars in a formula

Remove the random-effects terms from a mixed-effects formula, thereby producing the fixed-effects formula.

Usage

nobars(term)

nobars_(term)

Arguments

term

the right-hand side of a mixed-model formula

Value

the fixed-effects part of the formula

Note

This function is called recursively on individual terms in the model, which is why the argument is called term and not a name like form, indicating a formula.

See also

formula, model.frame, model.matrix.

Other utilities: expandDoubleVerts(), mkReTrms(), subbars()

Examples

nobars(Reaction ~ Days + (Days|Subject)) ## => Reaction ~ Days
#> Reaction ~ Days
#> <environment: 0x55db716b4b48>