RobustNorm.psi()
statsmodels.robust.norms.RobustNorm.psi
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RobustNorm.psi(z)[source] -
Derivative of rho. Sometimes referred to as the influence function.
Abstract method:
psi = rho’
© 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.RobustNorm.psi.html
