statsmodels.robust.norms.AndrewWave.psi
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AndrewWave.psi(z)
[source] -
The psi function for Andrew?s wave
The analytic derivative of rho
Parameters: z : array-like
1d array
Returns: psi : array
psi(z) = sin(z/a) for |z| <= a*pi
psi(z) = 0 for |z| > a*pi
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