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Take Two Orthogonals and Call Me in the Morning

Published online by Cambridge University Press:  02 January 2015

David Birnbaum
David Birnbaum*
Affiliation:
Applied Epidemiology, Sidney, British Columbia, Canada
*
Applied Epidemiology, 609 Cromar Road, Sidney, British Columbia V8L 5M5, Canada
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Abstract

Analysis of variance (ANOVA) is used to prevent inflated type I error when hypothesis testing involves comparing more than two groups. If an ANOVA result indicates a statistically significant difference exists somewhere within, the next task is to discover exactly which combination or combinations of those groups account for the significant difference. Among many methods available for that exploration, orthogonal contrasts and relatively simple graphs are noteworthy (Infect Control Hosp Epidemiol 2003;24:544-547).

Type
Statistics for Hospital Epidemiology
Information
Infection Control & Hospital Epidemiology , Volume 24 , Issue 7 , July 2003 , pp. 544 - 547
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2003

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References

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