negative.binomial            package: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)

