I have three variables measuring different aspects of performance each with a scale of 8 and I want to create a new Performance variable by computing these together. I have done this the following way: I've gone to "compute variable" in SPSS and chosen (var1+var2+var3)/3. Missing data is not a problem so I didn't have to add anything or that in the formula. Everything seems to be fine until this point and I only get full numbers between 1 and 8 by choosing "no decimals".
However, when I take the descriptive statistics for this new variable, it gives me the same number multiple times. Because of this, I am not sure if I have created the new variable in the right way and if I can start running regression analyses