Returns the value of the gaussian loglikelihood function at params.
Given the whitened design matrix, the loglikelihood is evaluated at the parameter vector params for the dependent variable endog.
Parameters : | params : array-like
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Returns : | loglike : float
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rac{n}{2} ext{ensuremath{log}}left(Y-hat{Y} ight)- rac{n}{2}left(1+logleft( rac{2pi}{n} ight) ight)- rac{1}{2} ext{log}left(left|Sigma ight| ight)]
Y and Y-hat are whitened.