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TukeyBiweight.weights()

statsmodels.robust.norms.TukeyBiweight.weights

TukeyBiweight.weights(z) [source]

Tukey?s biweight weighting function for the IRLS algorithm

The psi function scaled by z

Parameters:

z : array-like

1d array

Returns:

weights : array

psi(z) = (1 - (z/c)**2)**2 for |z| <= R

psi(z) = 0 for |z| > R

Links:

http://statsmodels.sourceforge.net/stable/generated/statsmodels.robust.norms.TukeyBiweight.weights.html

doc_statsmodels

2017-01-18 16:21:27

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