The Annals of Statistics
- Ann. Statist.
- Volume 15, Number 2 (1987), 642-656.
High Breakdown-Point and High Efficiency Robust Estimates for Regression
A class of robust estimates for the linear model is introduced. These estimates, called MM-estimates, have simultaneously the following properties: (i) they are highly efficient when the errors have a normal distribution and (ii) their breakdown-point is 0.5. The MM-estimates are defined by a three-stage procedure. In the first stage an initial regression estimate is computed which is consistent robust and with high breakdown-point but not necessarily efficient. In the second stage an M-estimate of the errors scale is computed using residuals based on the initial estimate. Finally, in the third stage an M-estimate of the regression parameters based on a proper redescending psi-function is computed. Consistency and asymptotical normality of the MM-estimates assuming random carriers are proved. A convergent iterative numerical algorithm is given. Finally, the asymptotic biases under contamination of optimal bounded influence estimates and MM-estimates are compared.
Ann. Statist. Volume 15, Number 2 (1987), 642-656.
First available in Project Euclid: 12 April 2007
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Yohai, Victor J. High Breakdown-Point and High Efficiency Robust Estimates for Regression. Ann. Statist. 15 (1987), no. 2, 642--656. doi:10.1214/aos/1176350366. https://projecteuclid.org/euclid.aos/1176350366.