R: Check if a model is empty

is.empty.model {base}

R Documentation

Check if a model is empty

Description

R model notation allows models with no intercept and no predictors. These require special handling internally. is.empty.model() checks whether an object describes an empty model.

Usage

is.empty.model(x)

Arguments

x

A terms object or an object with a terms method.

Value

TRUE if the model is empty

Examples

y<-rnorm(20)
is.empty.model(y~0)
is.empty.model(y~-1)
is.empty.model(lm(y~0))