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| Indirect effect in path model |
 
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I have two questions regarding indirect effect in a path model:
Firstly, in a model where x is exogenous variable, y is mediator, and z is outcome, I understand that the indirect effect Bxz is calculated by Bxy*Byz. However, if y is a continuous variable and z is a binary variable, then Bxy and Byz are based on different metrics. In this case, do I have to tell mplus that they are derived from two different scales? Or mplus will do it for me automatically?
Secondly, assuming that x is a 4-category nominal variable, then 3 dummies will be created to represent x. In this case, I would like to know if indirect effect can still be calculated since standardization does not seem available in this particular model.
Thank you very much. |
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You need to read the paper on our website to see how Mplus handles this correctly:
Muthén, B. & Asparouhov, T. (2015). Causal effects in mediation modeling: An introduction with applications to latent variables. Structural Equation Modeling: A Multidisciplinary Journal, 22(1), 12-23. DOI:10.1080/10705511.2014.935843 |
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