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# scikits.statsmodels.family.family.NegativeBinomial

class `scikits.statsmodels.family.family.``NegativeBinomial`(link=<scikits.statsmodels.family.links.Log object at 0x01A80F10>, alpha=1.0)

  Negative Binomial exponential family.

  Parameters: | link : a link instance, optional The default link for the negative binomial family is the log link. Available links are log, cloglog, identity, nbinom and power. See statsmodels.family.links for more information. alpha : float, optional The ancillary parameter for the negative binomial distribution. For now alpha is assumed to be nonstochastic. The default value is 1. Permissible values are usually assumed to be between .01 and 2.

  See also

  `statsmodels.family.family.Family`

  Notes

  Support for Power link functions is not yet supported.

  Attributes

  `link` | Helper method to get the link for a family.
  `variance` |

  Methods

  `devresid`(Y, mu) | Negative Binomial Deviance Residual
  `deviance`(Y, mu) |
  Parameters: |
  `loglike`(Y[, fittedvalues]) | The loglikelihood function for the negative binomial family.
  `resid_anscombe`(Y, mu) | The Anscombe residuals for the negative binomial family

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