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statsmodels.genmod.families.links.cauchy.inverse_deriv2¶

cauchy.inverse_deriv2(z)[source]¶

Second derivative of the inverse link function g^(-1)(z).

Parameters:
znumpy:array_like

z is usually the linear predictor for a GLM or GEE model.

Returns:
g^(-1)’’(z)ndarray

The value of the second derivative of the inverse of the link function

Notes

This method should be overwritten by subclasses.

The inherited method is implemented through numerical differentiation.

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