I'm using version 15 of stata, and I'm wondering if it is possible to make an exception within a loop. I have four variables which I currently have running through a loop. However, I've just realized that I need to pull in data from a different excel sheet for just one of the variables. Is it possible to, within the existing loop, create a command that will allow me to merge the data from this other excel sheet and use it just in the calculation of the one variable?