2018 | OriginalPaper | Buchkapitel

# 5. Orthogonality, Orthogonal Decomposition, and Their Role in Modern Experimental Design

Autoren: Paul D. Berger, Robert E. Maurer, Giovana B. Celli

## Abstract

_{c}), attributable to the factor under study, and the sum of squares within a column (SSW), the variability not explained by the factor under study, and instead explained by “everything else.” Finally, these quantities were combined with the appropriate degrees of freedom in order to assess statistical significance. We were able to accept or reject the null hypothesis that all column means are equal (or, correspondingly, reject or accept that the factor under study has an impact on the response). In Chap. 4, we discussed multiple-comparison techniques for asking more detailed questions about the factor under study; for example, if not all column means are equal, how do they differ? We now present a more sophisticated, flexible, and potent way to analyze (or “decompose”) the impact of a factor on the response, not limited to pairwise comparisons.