R: Check if a Model is Empty

is.empty.model {stats}

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))