# statsmodels.tsa.statespace.mlemodel.MLEModel.transform_jacobian¶

method

MLEModel.transform_jacobian(unconstrained, approx_centered=False)[source]

Jacobian matrix for the parameter transformation function

Parameters
unconstrainedarray_like

Array of unconstrained parameters used by the optimizer.

Returns
jacobianarray

Jacobian matrix of the transformation, evaluated at unconstrained

Notes

This is a numerical approximation using finite differences. Note that in general complex step methods cannot be used because it is not guaranteed that the transform_params method is a real function (e.g. if Cholesky decomposition is used).