kbat2012, sorry but there are just too many factors that would render such a study irrelevant.
*Percentage of body fat. Muscle weighs more than fat, so a 6'3" 215-pound pitcher with 28% body fat might not be as effective as a 6'0" 200-pound pitcher with 12% body fat.
*Arm speed. Some have it and some don't. Arm speed can be trained to some degree (such as through long toss) but generally it is genetic.
*Mechanics. How does one quantify "good mechanics"? You can have size and weight, but pitching is a kinetic chain and velocity is transferred throughout that chain irrespective of size and weight. Billy Wagner is a 5'8 pitcher who can throw upper-90's. Jamie Moyer is 5'10 and throws 84. Moyer has a lower body fat and clean mechanics.. so is it arm speed?
*Genetics. You can take pitching lessons, you can train, and you can long toss daily. Then get embarrassed by some dumb arss who does none of that and throws harder than you because his dad was a former MLB player. You just never know.
Sorry, but there are too many factors to quantify here.