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ERIC Number: ED395949
Record Type: RIE
Publication Date: 1996-Jan
Pages: 29
Abstractor: N/A
Reference Count: N/A
An Introduction to Graphical Analysis of Residual Scores and Outlier Detection in Bivariate Least Squares Regression Analysis.
Serdahl, Eric
The information that is gained through various analyses of the residual scores yielded by the least squares regression model is explored. In fact, the most widely used methods for detecting data that do not fit this model are based on an analysis of residual scores. First, graphical methods of residual analysis are discussed, followed by a review of several quantitative approaches. Only the more widely used approaches are discussed. Example data sets are analyzed through the use of the Statistical Package for the Social Sciences (personal computer version) to illustrate the various strengths and weaknesses of these approaches and to demonstrate the necessity of using a variety of techniques in combination to detect outliers. The underlying premise for using these techniques is that the researcher needs to make sure that conclusions based on the data are not solely dependent on one or two extreme observations. Once an outlier is detected, the researcher must examine the data point's source of aberration. (Contains 3 figures, 5 tables, and 14 references.) (SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers: Outliers; Residual Scores; Statistical Package for the Social Sciences PC
Note: Paper presented at the Annual Meeting of the Southwest Educational Research Association (New Orleans, LA, January 1996).