First of all, my background in statistics is a bit shaky these days due to a trauma to the brain. I am considering a study that examines at least three independent variables (e.g., creativity, locus of control, and assertiveness) on course grades (only grades were obtained not percentages . . . so this would be a ranking) in a college setting. The independent variables can be pushed into three different categories if needed (interval, ordinal, or nominal). Thus, I can use an interval score for creativity, for example. I can switch this to low versus high creativity as well (ordinal or nominal). Most would probably assume high creativity is better than low creativity (ranked), but some might think it is just nominal data.
I am thinking that ordinal regression is the best fit. Am I off base here?