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Contrast (statistics) : ウィキペディア英語版 | Contrast (statistics) In statistics, particularly in analysis of variance and linear regression, a contrast is a linear combination of variables (parameters or statistics) whose coefficients add up to zero, allowing comparison of different treatments. ==Definitions== Let be a set of variables, either parameters or statistics, and be known constants. The quantity is a linear combination. It is called a contrast if 〔Casella a Berger 2001, p. 526.〕〔Casella 2008, p. 11.〕 Furthermore, two contrasts, and , are orthogonal if 〔Casella 2008, p. 12.〕
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