Loglikelihood function for Gaussian exponential family distribution.
Y : array-like
Endogenous response variable
mu : array-like
Fitted mean response variable
scale : float, optional
Scales the loglikelihood function. The default is 1.
llf : float
The value of the loglikelihood function evaluated at (Y,mu,scale) as defined below.
scikits.statsmodels.family.family.Gaussian.deviance
scikits.statsmodels.family.family.Gaussian.resid_anscombe
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