This study seems OK to me. Here is why:
1) It measures a relation of income to giving...in essence generosity.
2) The giving in terms of money and/or items is pretty well calculated as items of donation on your tax return. Unless your donation is not worthy of donation, most people record it. I can't think of a better way to record donations.
3) Why are people attacking it over time? Is there any reason to believe that people in the lower ranked states would volunteer more time??!? I doubt that is even a factor that changes from state to state.
4) This is a pretty legitimate foundation and it's also based in Massachusetts and DC.
-Rudey
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