Issues in Predictive Discriminant Analysis: Using and Interpreting the Leave-One-Out Jackknife Method and the Improvement-Over-Change "I" Index Effect Size.

Prediction of group membership is the goal of predictive discriminant analysis (PDA) and the accuracy of group classification is the focus of PDA. The purpose of this paper is to provide an overview of how PDA works and how it can be used to answer a variety of research questions. The paper explains what PDA is and why it is important, and it presents an example of PDA that uses the leave-one-out method and interpretation of the "I" effect size proposed by C. Huberty and L. Lowman (2000). An illustrative data set is used to make the discussion concrete and accessible to applied researchers. (Contains 4 tables and 13 references.) (Author/SLD) Reproductions supplied by EDRS are the best that can be made from the original document. LOO Method and I Index 1 Running head: LOO Method and I Index Issues in Predictive Discriminant Analysis: Using and Interpreting the Leave-One-Out Jackknife Method and the Improvement-Over-Chance I Index Effect Size Dae-Yeop Hwang University of North Texas PERMISSION TO REPRODUCE AND DISSEMINATE THIS MATERIAL HAS BEEN GRANTED BY