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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

© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3-clause BSD License.
http://www.statsmodels.org/stable/generated/statsmodels.genmod.families.links.NegativeBinomial.deriv2.html