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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]) 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

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