Test if a Model's Formula is Empty

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Description

R's formula 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

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Arguments

x

A terms object or an object with a terms method.

Value

TRUE if the model is empty

See Also

lm, glm

Examples

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

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