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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 \theta_1,\ldots,\theta_t be a set of variables, either parameters or statistics, and a_1,\ldots,a_t be known constants. The quantity \sum_^t a_i \theta_i is a linear combination. It is called a contrast if 〔Casella a Berger 2001, p. 526.〕〔Casella 2008, p. 11.〕 Furthermore, two contrasts, \sum_^t a_i \theta_i and \sum_^t b_i \theta_i, are orthogonal if 〔Casella 2008, p. 12.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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