Returns the deviance residuals for the inverse Gaussian family.
Parameters: | endog : array-like
mu : array-like
freq_weights : array-like
scale : float, optional
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Returns: | resid_dev : array
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Notes
resid\_dev_i = sign(Y_i - \mu_i) * \sqrt {(Y_i - \mu_i)^2 / (Y_i * \mu_i^2)} / scale