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i.varname1*varname3 creates dummies for categorical variable varname1 and continuous variable varname3: all interactions and main effects
i.varname1|varname3 creates dummies for categorical variable varname1 and continuous variable varname3: all interactions and main effect of varname3, but no main effect of varname1
还有这个interactions 和main effect是什么意思啊,新手求助,谢谢
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