R: Test if a Model's Formula is Empty

is.empty.model {stats} | R Documentation

## Test if a Model's Formula is Empty

### 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

    is.empty.model(x)

### Arguments

`x` | A `terms` object or an object with a `terms` method.

### Value

`TRUE` if the model is empty

### See Also

`lm`, `glm`

### Examples

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

[Package stats version 3.1.2 Index]