Loglikelihood of linear model with t distributed errors.
Parameters : | params : array
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Returns : | loglike : array, (nobs,)
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Notes
The t distribution is the standard t distribution and not a standardized t distribution, which means that the scale parameter is not equal to the standard deviation.
self.fixed_params and self.expandparams can be used to fix some parameters. (I doubt this has been tested in this model.)