Returns the score with respect to untransformed parameters.
Calculates the score vector for the profiled log-likelihood of the mixed effects model with respect to the parameterization in which the random effects covariance matrix is represented in its full form (not using the Cholesky factor).
Parameters: | params : MixedLMParams or array-like
calc_fe : boolean
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Returns: | score_fe : array-like
score_re : array-like
score_vc : array-like
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Notes
score_re is taken with respect to the parameterization in which cov_re is represented through its lower triangle (without taking the Cholesky square root).