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ERIC Number: ED428117
Record Type: Non-Journal
Publication Date: 1999-Jan
Pages: 17
Abstractor: N/A
Reference Count: N/A
Fragile--Handle with Care: Regression Analyses That Include Categorical Data.
Brown, Diane Peacock
In education and the social sciences, problems of interest to researchers and users of research often involve variables that do not meet the assumptions of regression in the area of an equal interval scale relative to a zero point. Various coding schemes exist that allow the use of regression while still answering the researcher's questions of interest contextually. The coding alternatives, which are used to create "dummy" or "effect" variables, are illustrated using data from a study of special education inclusion (L. Daniel and D. King, 1998). The application illustrates that categorical variables may be successfully combined in regression analyses with continuous variables. For dichotomous predictors, the coding scheme is arbitrary as long as each of the two categories is assigned a numerically different value. Categorical variables with three or more categories can yield varying results depending on the coding scheme used. (Contains 1 table and 10 references.) (SLD)
Publication Type: Reports - Descriptive; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A