NotesFAQContact Us
Search Tips
ERIC Number: ED406447
Record Type: Non-Journal
Publication Date: 1997-Jan-23
Pages: 33
Abstractor: N/A
Reference Count: N/A
Use of Stepwise Methodology in Discriminant Analysis.
Whitaker, Jean S.
The use of stepwise methodologies has been sharply criticized by several researchers, yet their popularity, especially in educational and psychological research, continues unabated. Stepwise methods have been considered particularly well suited for use in regression and discriminant analyses, but their use in discriminant analysis (predictive discriminant analysis and descriptive discriminant analysis) has not been the direct focus of as much written commentary. This discussion considers several problems associated with the use of stepwise methods. These include: (1) incorrect degrees of freedom associated calculated by computer packages; (2) sampling error capitalization; and (3) failure to select the best subset of predictors. Although they offer the promise of assisting researchers with tasks such as variable selection and variable ordering, this promise is almost always unfulfilled. Some alternatives to the use of stepwise methods are discussed, including manually correcting degrees of freedom, cross-validation procedures, and all-possible subsets analyses. (Contains 6 tables and 45 references.) (Author/SLD)
Publication Type: Reports - Descriptive; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A