# Drop All Possible Single Terms from or Add Terms to a Model Fitted by regr

### Description

`drop1.regr`

/ `add1.regr`

performs a test for the suitability
of dropping / adding each term in scope from / to a regression model
fitted by `regr`

### Usage

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### Arguments

`object` |
a fitted model object |

`scope` |
a formula giving the terms to be considered for dropping
or adding. |

`scale` |
an estimate of the error variance if applicable. Will be recalculated from the fit if ==0 or NULL |

`test` |
see |

`k` |
the penalty constant in AIC / Cp |

`sorted` |
if TRUE, the result is sorted according to the AIC or, if absent, the p value |

`add` |
converts |

`...` |
further arguments passed to the model specific methods |

### Value

A data.frame of class '"anova"' summarizing the differences in fit
between the models obtained by dropping or adding the terms and the
original model given by `object`

### Author(s)

Werner A. Stahel, ETH Zurich

### See Also

`drop1`

, `add1`

### Examples

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