I have been tinkering with my own projections and was wondering what are the basic formulas everyone uses. I would ideally like to get some formulas on here, discuss the pro's and cons, and maybe create some new formulas.

I will start off with a basic projection that is simple but effective (I believe on a scale of 0-1 it was a .68 in accuracy on Prospectus).

.5(last years stats) + .33(2 years ago stats) + .17(3 years ago stats)

obviously the method has its flaws. It discounts players like Casey who have been injury ravaged the past two years.

What formulas is everybody using for their projections?