Trimmed mean function for M-estimation.
| Parameters: | c : float, optional
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Methods
| psi(z) | The psi function for least trimmed mean |
| psi_deriv(z) | Abstract method: |
| psi_derive(z) | The derivative of least trimmed mean psi function .. |
| rho(z) | The robust criterion function for least trimmed mean. |
| weights(z) | Least trimmed mean weighting function for the IRLS algorithm |