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 – psi(z) = (1 - (z/c)**2)**2 for |z| <= R psi(z) = 0 for |z| > R |
| Return type: | array |
© 2009–2012 Statsmodels Developers
© 2006–2008 Scipy Developers
© 2006 Jonathan E. Taylor
Licensed under the 3-clause BSD License.
http://www.statsmodels.org/stable/generated/statsmodels.robust.norms.TukeyBiweight.weights.html