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Exploring Cook's Statistic Graphically |
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| Authors: | R J O'Hara Hines W G S Hines |
| Institution: | 1. Department of Statistics and Actuarial Science , University of Waterloo , Waterloo , ON N2L 3G1 , Canada;2. Department of Mathematics and Statistics , University of Guelph , Guelph , ON N1G 2W1 , Canada |
| Abstract: | An index plot of Cook's statistic is frequently used to highlight influential observations. In this article we illustrate how enhanced higher dimensional plots of Cook's statistic can provide further useful information about sets of influential observations. We provide examples using normal and generalized linear models. |
| Keywords: | Exploratory data analysis Groups of influential observations Masked influence |