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https://dl.sciencesocieties.org/publications/aj/abstracts/51/9/AJ0510090515

Over the past several decades, path analysis has become very popular in the social sciences, so if you feed your query into Google, you will get over a million hits.

I took a look several of them, and the attached is one of the most accessible (note that it uses the terminology "mediation" for indirect effects, where that language is drawn from coverage of this subject in psychology).

Thank you for your answers 

Here is the one I found very useful.

Hi everyone.

I have a question. When you are calculating the indirect and total effects. Should you calculate the indirect effect of all combinations of paths or just the ones I am interested in?

So for example, if I can have in the model the combination of three paths such as:

a*b*c, a*b*d or two paths: b*c, b*d, a*b, a*d,

So for me the interesting indirect effects are the ones with the two paths, but should I also calculate the three-way paths for the reader and for the sake of calculating the total effects?

Also how do I decide how will the total effects be calculated. If I only place the two paths, what, if some path combinations repeat? Is that not ok?

All best, Nina