The likelihood function for the OLS model.
params : array-like
The coefficients with which to estimate the log-likelihood.
scale : float or None
If None, return the profile (concentrated) log likelihood (profiled over the scale parameter), else return the log-likelihood using the given scale value.
The likelihood function evaluated at params. :
statsmodels.regression.linear_model.OLS.initialize
statsmodels.regression.linear_model.OLS.predict
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