HuberT.psi()
statsmodels.robust.norms.HuberT.psi
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HuberT.psi(z)
[source] -
The psi function for Huber’s t estimator
The analytic derivative of rho
Parameters: z : array-like
1d array
Returns: psi : array
psi(z) = z for |z| <= t
psi(z) = sign(z)*t for |z| > t
© 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.HuberT.psi.html