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  • statsmodels.genmod.families.links.NegativeBinomial |

statsmodels.genmod.families.links.NegativeBinomial.deriv2¶

NegativeBinomial.deriv2(p)[source]¶

Second derivative of the negative binomial link function.

Parameters:p (array-like) – Mean parameters
Returns:g’‘(p) – The second derivative of the negative binomial transform link function
Return type:array

Notes

g’‘(x) = -(1+2*alpha*x)/(x+alpha*x^2)^2

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