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AndrewWave.psi()

statsmodels.robust.norms.AndrewWave.psi

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

Links:

http://statsmodels.sourceforge.net/stable/generated/statsmodels.robust.norms.AndrewWave.psi.html

doc_statsmodels

2017-01-18 16:06:28

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