我想问一下,在用SAS软件设计DCE时,如何添加约束,这样就不会出现两个不能组合在一起的关卡,只留下合理的组合?例如,有两个层次的会诊:线上会诊和线下会诊,有两个层次的核酸检测:是和否。在线咨询只能与没有核酸检测相结合。SAS 中可以使用什么语法来实现此约束?
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