Greetings, I would be really grateful for a bit of advice. I want to demonstrate discriminate and convergent validity of the latent variables in my model. As I have a predetermined idea about which items should load onto which factors I understand that confirmatory factor analysis (CFA) is the most appropriate way of testing construct validity (I am using AMOS). Once I have tested and modified the model to obtain a suitable fit, I intend to use the handy Stats tool on James Gaskin's statwiki page to obtain the AVE scores etc

http://statwiki.kolobkreations.com/index.php?title=Main_Page

My main question is: in order to test construct validity, do I need to add covariances between the exogenous variables? I am not interested in the extent to which the 3 exogenous variables are related except in relation to the issue of discriminant validity.

many thanks for any help you can offer. Nick

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