One question would be whether or not to match the files on subject/grade/teacher... | Hacker News

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		DataWorker on Jan 28, 2013 \| parent \| context \| favorite \| on: The 50 million dollar lie One question would be whether or not to match the files on subject/grade/teacher, or just the teacher. You use subject/grade/teacher level, but you get a different answer if you use aggregated teacher level.

DataWorker on Jan 28, 2013 [–]

I tried it by teacher and got a correlation of .45.

(I used unweighted average for each teacher/school/year.)

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