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;作者: shiyiming 时间: 2006-8-3 01:07 标题: to nfiona 对中文统计名称不太熟悉的说，第一次回贴，不要笑话哈作者: shiyiming 时间: 2006-8-3 11:17 标题: 已经解决 谢谢各位的回帖，该问题我已经解决。希望以后多多交流。本人对于sas不是特别精通，只是会些皮毛。关于什么是联合方差分析，就是我做一年多点试验，首先对各点进行方差同质测验，如果一致，就可以把各点联合起来进行方差分析，如果不一致，就不能进行联合方差分析了。