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, as a character string, name or one-element character vector specifying one of `log`, `sqrt` or `identity`, or an object of class `"link-glm"`.

### Value

An object of class `"family"`, a list of functions and expressions needed by `glm()` to fit a Negative Binomial generalized linear model.

### References

Venables, W. N. and Ripley, B. D. (1999) Modern Applied Statistics with S-PLUS. Third Edition. Springer.

### See Also

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

### Examples

    # Fitting a Negative Binomial model to the quine data
    #   with theta = 2 assumed known.
    #
    glm(Days ~ .^4, family = negative.binomial(2), data = quine)

[Package MASS version 7.2-49 Index]