statsmodels.genmod.families.family.Poisson.starting_mu

Poisson.starting_mu(y)

Starting value for mu in the IRLS algorithm.

Parameters:

y (ndarray) – The untransformed response variable.

Returns:

mu_0 – The first guess on the transformed response variable.

Return type:

ndarray

Notes

\[\mu_0 = (Y + \overline{Y})/2\]

Only the Binomial family takes a different initial value.