statsmodels.robust.norms.TrimmedMean.psi¶
- TrimmedMean.psi(z)[source]¶
The psi function for least trimmed mean
The analytic derivative of rho
- Parameters:
- zarray_like
1d array
- Returns:
- psi
ndarray psi(z) = z for |z| <= c
psi(z) = 0 for |z| > c
- psi
The psi function for least trimmed mean
The analytic derivative of rho
1d array
ndarraypsi(z) = z for |z| <= c
psi(z) = 0 for |z| > c