statsmodels.genmod.families.family.Poisson¶
-
class
statsmodels.genmod.families.family.Poisson(link=<class 'statsmodels.genmod.families.links.log'>)[source]¶ Poisson exponential family.
Parameters: link : a link instance, optional
The default link for the Poisson family is the log link. Available links are log, identity, and sqrt. See statsmodels.family.links for more information.
Attributes
Poisson.link a link instance The link function of the Poisson instance. Poisson.variance varfuncs instance variance is an instance of statsmodels.genmod.families.family.varfuncs.mu Methods
deviance(endog, mu[, scale])Poisson deviance function fitted(lin_pred)Fitted values based on linear predictors lin_pred. loglike(endog, mu[, scale])The log-likelihood function in terms of the fitted mean response. predict(mu)Linear predictors based on given mu values. resid_anscombe(endog, mu)Anscombe residuals for the Poisson exponential family distribution resid_dev(endog, mu[, scale])Poisson deviance residual starting_mu(y)Starting value for mu in the IRLS algorithm. weights(mu)Weights for IRLS steps