I thought I had posted this earlier. It is a set of graphical illustrations of CMI from 1940 to 2007. For comparison sake, I have included NFL average QB Rating in the 2nd graph. CMI is defined as follows:
CMI = Completions/Attempts - 3 * Interceptions/Attempts
This ratio can never exceed 100.0% (although it can be negative).
In my mind, a running back has 2 duties once he receives the ball - run with it, and don't fumble it. Similarly, a wide receiver has 2 duties once he receives (catches) the ball - run with it, and don't fumble it. And, a quarterback, similarly has 2 duties - complete the pass, and don't turn it over. I realize it's too simplistic a view. Eventually, I will incorporate sacks and fumbles into the formula. Since I am very interested in comparing quarterbacks over time, once sacks are included, I can only go back in time to 1969 (since sack data was included).
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