# statsmodels.genmod.families.family.NegativeBinomial.starting_mu¶

NegativeBinomial.starting_mu(y)

Starting value for mu in the IRLS algorithm.

Parameters:
yndarray

The untransformed response variable.

Returns:
mu_0ndarray

The first guess on the transformed response variable.

Notes

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

Only the Binomial family takes a different initial value.