Today our education reporter had a bunch of data from New York State she was trying to match to schools in New York City. But the school codes used by the two governments look radically different.For example, PS 15 on the Lower East Side is known to the state as 310100010015; the city calls it 01M015.I once made a nifty formula to make the conversion(!), but a more straightforward and official approach involves the Excel spreadsheet found here. It lists all of the city schools, along with their addresses, various codes, and more. For a data cruncher, that's a secret decoder ring.What made me smile was that the only reason I knew this document even existed was because of a little prototype I tried during the first swine flu outbreak. That experiment wasn't robust enough to make it beyond this blog, but it taught me a lot ... including where to find this ring!