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Example 29
The posterior distribution of the indirect effect lies entirely to the left of 0, so we are 
practically certain that the indirect effect is less than 0.
You can also display the posterior distribution of the direct effect. The program does 
not, however, have any built-in way to examine the posterior distribution of the 
difference between the indirect effect and the direct effect (or perhaps their ratio). This 
is a case of wanting to estimate and draw inferences about a quantity that the 
developers of the program did not anticipate. For this, you need to extend the 
capabilities of Amos by defining your own custom estimand.