For the purposes of definining “supply” and having credibility to the masses, I think its important to be specific and credible. If you come up with a credible new metric that can be backtested MrMortgage, the best thing you can do is have other well-reputed industry experts validate it (sited as resources) before releasing it to the public and being lambasted. We as a country have suffered from too much fuzzy math. I think your analysis is fantastic so don’t let the questioning of some of your stats or definition of them devalue all of the good points. You’re only as good as your weakest link.