You are going to have a lot of omitted variables bias if you don't control for some of the factors like quality of school (as measured by how many kids go to the NFL, some statistic that reflects their record, etc). In addition, you need to define success. Is it getting to the NFL, or specifically getting drafted? You could use an indicator variable and then do a Tobit or Probit model to examine this. But many other predictors are difficult to manage. You will also need to understand the dynamics of the position. A 4 year starter at Quarterback is unlikely (if they are good enough to start three years they probably will depart for the draft), so you must determine what your measure of quality is. (Also remember that if you use a number like, how many games started or played that those are COUNT VARIABLES, and so you must use something like a Poisson Regression or a Negative Binomial Regression.)
Once you have figured out your measure, let me know about what you are doing with your regression and I can try to help.
GO BLUE.
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