Zach - I like the though, am a son of CPA, but I think a little creative thinking would be in order here vs a true formula. I.e. a Cracker Jack Joe jacskon would have a MUCH higher percentage of cards graded vesus raw comparing to a common card. Compare that to say a 1934 goudey hank greenberg...more cards, smaller percent graded with probably more sitting in private collections, undisclosed as well. I would think some cards, like an e107, would have nearly 100% in slabs. Sooo many variables involved. Your formula would have to include these varibales...complicated at best. Good luck!
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