Hi all,

I have 150 patients each of will be assigned to 2 treatments (TX1, TX2). My goal is to compute a list that randomly assigns each patient a 1 or a 2 for each treatment. The result would look like this:

ID TX1 TX2 1 1 2 2 2 1 3 2 1 4 1 2

....where the 1 and the 2 are randomly generated by SPSS. Patient 1 would have Treatment 1 1st followed by Treatment 2. Patient 2 is in the opposite order.

I have tried computing TX1 using one of the random number functions but the key is that if 1 is assigned to TX1 then 2 has to be assigned to TX2 and vice versa.

This seems really simple but I'm not sure of how to go about doing this. Ideas?

Thanks Carol P Sacramento CA