Nebraska-Northwestern Offensive Play Selection and Success Rate

This season I've been working to develop some advanced game statistics. One I've worked with is looking at play selection and success rate by downs. Carries that result in lost fumbles, or intercepted passes are not included, as they would significantly skew the average gain per carry/pass number.

This first chart is the number of carries and rushes by Nebraska and Northwestern, by down and game.

This next chart shows the success rate by downs. Success rate is defined as gaining at least 50% of "yards to go" on 1st and 2nd downs, and 100% of "yards to go" on 3rd down.

As I said before, this is a work in progress, and I'm looking for comments on whether these are meaningful to the general user.

Oh, and GBR!