Loglikelihood of linear model with t distributed errors.
System Message: WARNING/2 (\ln L=\sum_{i=1}^{n}\left[-\lambda_{i}+y_{i}x_{i}^{\prime}\beta-\ln y_{i}!\right]
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Transcript written on math.log.
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.)