Tweedie Deviance Residual
Parameters: | endog : array-like
mu : array-like
scale : float, optional
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Returns: | resid_dev : array
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Notes
When p = 1,
resid\_dev_i = \mu
when endog = 0 and
resid\_dev_i = endog * \log(endog / \mu) + (\mu - endog)
otherwise.
When p = 2,
resid\_dev_i = (endog - \mu) / \mu - \log(endog / \mu)
For all other p,
resid\_dev_i = endog ^{2 - p} / ((1 - p) * (2 - p)) - endog * \mu ^{1 - p} / (1 - p) + \mu ^{2 - p} / (2 - p)