Loglikelihood function for inverse Gaussian distribution.
Y : array-like
Endogenous response variable
mu : array-like
Fitted mean response variable
scale : float, optional
The default is 1.
llf : float
The value of the loglikelihood function evaluated at (Y,mu,scale) as defined below.
Notes
llf = -(1/2.)*sum((Y-mu)**2/(Y*mu**2*scale) + log(scale*Y**3) + log(2*pi))
sm.genmod.families.family.InverseGaussian.fitted
sm.genmod.families.family.InverseGaussian.predict
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