Returns the Hessian matrix of the log-likelihood evaluated at a given point, calculated with respect to the parameterization in which the random effects covariance matrix is represented through its Cholesky square root.
Parameters: | params : MixedLMParams or array-like
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Returns: | The Hessian matrix of the profile log likelihood function, : evaluated at `params`. : |
Notes
If params is provided as a MixedLMParams object it may be of any parameterization.