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ERIC Number: ED314496
Record Type: Non-Journal
Publication Date: 1990-Jan
Pages: 24
Abstractor: N/A
Reference Count: N/A
Beware the Dangers of Discarding Variance.
Prosser, Barbara
The value of variance is emphasized, and the element of design, frequently not adequately understood, is clarified to underscore the importance of variance to the researcher. Two analytic methods, analysis of variance (ANOVA) and multiple regression, are discussed in terms of how each uses/applies variance. Advantages and major difficulties with ANOVA are described, with the main problem with ANOVA and related methods being that they require predictor variables to be nominally scaled. The strengths of multiple regression are presented, and the use of planned comparisons is discussed. Discarding variance is cited as one of the prevalent methodology errors in education dissertations. The tendency to equate ANOVAs with experimental designs leads to the discarding of variance through the process of putting continuous variables into categories. A small data set of six groups illustrates how keeping all variance can help provide a more effective and sensitive analysis of data. One data table and a 26-item list of references are included. (SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: Researchers
Language: English
Sponsor: N/A
Authoring Institution: N/A