nbinom.deriv2()
statsmodels.genmod.families.links.nbinom.deriv2
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nbinom.deriv2(p)
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Second derivative of the negative binomial link function.
Parameters: p : array-like
Mean parameters
Returns: g’‘(p) : array
The second derivative of the negative binomial transform link function
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.nbinom.deriv2.html