statsmodels.genmod.families.family.Poisson¶
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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])Loglikelihood function for Poisson exponential family distribution. 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