score test for restrictions or for omitted variables
The covariance matrix for the score is based on the Hessian, i.e. observed information matrix or optionally on the expected information matrix..
Parameters: | params_constrained : array_like
k_constraints : int or None
exog_extra : None or array_like
observed : bool
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Returns: | chi2_stat : float
p-value : float
df : int
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Notes
not yet verified for case with scale not equal to 1.