Tukey’s biweight function for M-estimation.
| Parameters: | c : float, optional
|
|---|
Notes
Tukey’s biweight is sometime’s called bisquare.
Methods
| psi(z) | The psi function for Tukey’s biweight estimator |
| psi_deriv(z) | The derivative of Tukey’s biweight psi function |
| rho(z) | The robust criterion function for Tukey’s biweight estimator |
| weights(z) | Tukey’s biweight weighting function for the IRLS algorithm |