Hello mates! I am now doing a research with an unbalanced panel dataset. The model I apply is as follow: Y=a*X+b*X^2+c*other control variables. However, I think X can also affect Y via other channel, which is : X-->Z-->Y (this is called indirect effect). And i am now confused on what kind of procedure or codes that can help me to identify whether this indirect effect exists or not? Since i am very fresh towards SAS, hoping the one who can help me can provide some explanation on the code used. Much appreciate!
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