How to use iv*iv in regression

[Lucas Long]

Hello everyone:

Is there anyway that i can run a reg like: reg dv iv1 iv2 iv3*iv4
By which mean iv3*iv4, I already have iv3 and iv4 available, is there any easyway other than generate a new variable: iv5=iv3*iv4?

Thanks,

[Carlo Lazzaro]

Lucas:
as per -fvvarlist- notation (that I strongly recommend you to read; see -help fvvarlist- and related entry in Stata .pdf manual), you may want to consider something along the following lines:

*Interaction between continuous predictors*
reg dv iv1 iv2 c.iv3##c.iv4
*Interaction between categorical predictors*
reg dv iv1 iv2 i.iv3##i.iv4

You can easily tweak the code yourself if the interaction is composed of a continuous and a categorical predictor.