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The forward search: Theory and data analysis
Anthony C. Atkinson,Marco Riani,Andrea Cerioli 한국통계학회 2010 Journal of the Korean Statistical Society Vol.39 No.2
The Forward Search is a powerful general method, incorporating flexible data-driven trimming, for the detection of outliers and unsuspected structure in data and so for building robust models. Starting from small subsets of data, observations that are close to the fitted model are added to the observations used in parameter estimation. As this subset grows we monitor parameter estimates, test statistics and measures of fit such as residuals. The paper surveys theoretical development in work on the Forward Search over the last decade. The main illustration is a regression example with 330 observations and 9 potential explanatory variables. Mention is also made of procedures for multivariate data, including clustering,time series analysis and fraud detection.