Deviance of (Y,mu) pair.
Deviance is usually defined as twice the loglikelihood ratio.
Parameters : | Y : array-like
mu : array-like
scale : float, optional
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Returns : | DEV : array
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Notes
DEV = (sum_i(2*loglike(Y_i,Y_i) - 2*loglike(Y_i,mu_i)) / scale
The deviance functions are analytically defined for each family.