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板凳

楼主 |
发表于 2006-8-3 01:03:42
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to lum28
是Covariance 吧?
Analysis of Covariance (ANCOVA)
Analysis of Covariance, or ANCOVA, combines features of ANOVA and regression. That is, examine treatment differences adjusted for covariate. Similarly, determine whether there is a significant relationship between X and Y after adjusting for treatment. ANCOVA is typically done using proc glm.
proc glm; /* analysis of covariance */
class trt; /* trt = factor, x = covariate */
model y = x trt;
proc glm; /* analysis of covariance */
class trt; /* with different slopes */
model y = x trt x*trt; |
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