is_interaction: Identify interactions.

Description Usage Arguments Value

View source: R/formula.R

Description

A call is an interaction if it is a simple call (?is_simple) that contains no '+' operators. This is significant because it can be processed as a single contrast/covariate.

Usage

1

Arguments

x

call to check

Value

TRUE iff the call is an interaction.


sakrejda/hierarchy documentation built on Aug. 23, 2019, 7:15 p.m.