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st: Path model interpretation

From   "Michael Cha" <>
To   "statalist" <>
Subject   st: Path model interpretation
Date   Tue, 24 Sep 2002 12:22:01 -0400

Dear listers,

I am writing to get some help regarding the relatioinship among variables. 

I have two independent variables (A and B) and a dependent variable (C). 


Theoretically, A has a negative effect on C and B has a positive effect on C. Also, A has a negative effect on B. 

Without path from A to B, each effects appear to be as expected. 

However, if I add a path from A to B which is negative, then the path from A to C becomes positive, which is theoretically assumed to be negative.

How can I understand this? 

Any comments will be appreicated. 


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