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ERIC Number: ED450157
Record Type: Non-Journal
Publication Date: 2001-Feb
Pages: 11
Abstractor: N/A
Reference Count: N/A
ISBN: N/A
ISSN: N/A
Experimentwise Type I Error: What Are They and How Do They Apply to Both Univariate Post Hoc and Multivariate Testing?
Davis, Brandon
This paper reviews the concept of experimentwise Type I error. While "testwise" alpha refers to the probability of making a Type I error for a single hypothesis test, "experimentwise" error refers to the probability of having made a Type I error anywhere within the study. Experimentwise error concerns are the basis for two common statistical practices (i.e., analysis of variance (ANOVA) post hoc tests and multivariate tests), and researchers will not understand these two applications if the basic concept of experimentwise error is not understood. First, ANOVA post hoc tests implicitly incorporate a correction for experimentwise error, using adjustments similar to the Bonferroni correction. Second, experimentwise error concerns are one reason why multivariate tests are almost always vital in educational research. (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