negative.binomial {MASS} | R Documentation

## Family function for Negative Binomial GLMs

### Description

Specifies the information required to fit a Negative Binomial generalized linear model, with known `theta` parameter, using `glm()`.

### Usage

    negative.binomial(theta=stop("theta must be specified"), link="log")

### Arguments

`theta` | The known value of the additional parameter, `theta`.
`link` | The link function. Currently must be one of `log`, `sqrt` or `identity`.

### Value

A list of functions and expressions needed by `glm()` to fit a Negative Binomial generalized linear model.

### See Also

`glm.nb`, `anova.negbin`, `summary.negbin`

### Examples

    # Fitting a Negative Binomial model to the quine data
    #   with theta=2 assumed known.
    #
    data(quine)
    quine.nb <- glm(Days ~ .^4, family=neg.bin(2), data=quine)