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statsmodels.genmod.families.links.NegativeBinomial.deriv¶

NegativeBinomial.deriv(p)[source]¶

Derivative of the negative binomial transform

Parameters:
pnumpy:array_like

Mean parameters

Returns:
g’(p)ndarray

The derivative of the negative binomial transform link function

Notes

g’(x) = 1/(x+alpha*x^2)

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