nobars: Omit terms separated by vertical bars in a formula
Description
Remove the random-effects terms from a mixed-effects
formula, thereby producing the fixed-effects formula.
Usage
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.