statsmodels.genmod.families.family.Gamma.starting_mu¶

Gamma.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.