statsmodels.robust.norms.LeastSquares.psi¶
- LeastSquares.psi(z)[source]¶
The psi function for the least squares estimator
The analytic derivative of rho
- Parameters:¶
- zarray_like
1d array
- Returns:¶
- psi
ndarray
psi(z) = z
- psi
Last update:
Dec 23, 2024