Some researchers think that all product variables are interactions.
Whether you believe that all product variables are interactions or not, it is the case that all interations can be concieved of as product variables. Stata Example We will use the htwt dataset to illustrate the product variables. 9.0g Height at Age 16 in Centimeters 3. 9.0g Weight at Age 16 in Kilograms 4. Obs Mean Std.