No, that's not the methodology.
The ordinal ranks are created FIRST, and then the ORDINAL ranks are subtracted. The raw AGI per capita versus Charitable Deductions per capita comparison is NOT made.
See my post #7 above... I point out that the general pattern is similar when you use actual amounts, not just ordinal ranks, but that's also a very selective analysis of the data. Let's not play the same games the lefties do.