How much can the owner of a CPA firm make? I'm planning to get the CPA license and start my own small CPA firm. I want to hire bookkeepers and outsource the work overseas to save on overhead costs. I already have a large family of about 80 people, so I believe I can make at least 100 clients in my first year and do their taxes.
A correlation by definition, has no dependent and independent variable. It treats both variables equally. And each correlation is only about two variables. However, some people call observational studies correlational even if they use regressions. In a regression the independent variables are the ones you think predict or cause the dependent variable; or they are the ones under your control. Often the DV vs. IV distinction is one of substantive logic, not statistics.
An interaction variable is a variable constructed from an original set of variables to try to represent either all of the interaction present or some part of it. In exploratory statistical analyses it is common to use products of original variables as the basis of testing whether interaction is present with the possibility of substituting other more realistic interaction variables at a later stage.