Hampel function for M-estimation.
| Parameters: | a : float, optional b : float, optional c : float, optional
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Methods
| psi(z) | The psi function for Hampel’s estimator |
| psi_deriv(z) | |
| rho(z) | The robust criterion function for Hampel’s estimator |
| weights(z) | Hampel weighting function for the IRLS algorithm |