def crb(self, params=None, *args, **kwargs):
fish = self.fisherinformation(params=params, *args, **kwargs)<EOL>return np.sqrt(np.diag(np.linalg.inv(fish))) * self.sigma<EOL>
Calculate the diagonal elements of the minimum covariance of the model
with respect to parameters params. ``*args`` and ``**kwargs`` go to
``fisherinformation``.