# statsmodels.robust.norms.RobustNorm¶

class statsmodels.robust.norms.RobustNorm[source]

The parent class for the norms used for robust regression.

Lays out the methods expected of the robust norms to be used by statsmodels.RLM.

Notes

Currently only M-estimators are available.

References

PJ Huber. ‘Robust Statistics’ John Wiley and Sons, Inc., New York, 1981.

DC Montgomery, EA Peck. ‘Introduction to Linear Regression Analysis’,

John Wiley and Sons, Inc., New York, 2001.

R Venables, B Ripley. ‘Modern Applied Statistics in S’

Springer, New York, 2002.

Methods

 Derivative of rho. Derivative of psi. The robust criterion estimator function. Returns the value of psi(z) / z