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imported>Melcombe
be specific about the design matrix
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In [[statistics]], a '''design matrix''' is a [[matrix (mathematics)|matrix]] of [[explanatory variable]]s, often denoted by '''X''', that is used in certain statistical models, e.g., the [[general linear model]].<ref>Everitt,B.S. (2002) ''Cambridge Dictionary of Statistics'', CUP. ISBN 0-521-91099-xX {{Please check ISBN|reason=Check digit (X) does not correspond to calculated figure.}}</ref><ref>[[George E. P. Box|Box, G.E.P.]], Tiao, G.C. (1973) ''Bayesian Inference in Statistical Analysis'', Wiley. ISBN 0-471-57427-7 {{Please check ISBN|reason=Check digit (7) does not correspond to calculated figure.}} (Section 8.1.1)</ref>
It can contain [[indicator variable]]s (ones and zeros) that indicate group membership in an [[ANOVA]].