statsmodels.robust.norms.AndrewWave.psi¶
- AndrewWave.psi(z)[source]¶
The psi function for Andrew’s wave
The analytic derivative of rho
- Parameters:¶
- zarray_like
1d array
- Returns:¶
- psi
ndarray
psi(z) = a * sin(z/a) for |z| <= a*pi
psi(z) = 0 for |z| > a*pi
- psi
Last update:
Oct 03, 2024