I know correlation does not imply causation. I have read it nth time. (i.e. weight does not cause height etc. etc.)
However, to find the effect of a moderator variable on X-Y relationship, a regression model is used such as the GLM in SPSS to test for interaction or multiple regression. See here.
My Question: If the X-Y relationship is a correlation, then why is a cause-effect model used in this instance?
As far as I understand, it makes little sense to classify a variable as independent or dependent in a correlation analysis.
I apologise if this seems like a 'silly' question. In my past life, I had often told my students that there are no silly questions; just questions!