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My question is about differences between the following:

  1. comparison across the two classrooms
  2. comparison between classroom A and classroom B

Would you answer my question?

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It may prove helpful to clarify what form you'd like answers to take or what specifically you are wondering about the difference. – Tyler James Young Apr 10 '13 at 15:30

There is little difference in meaning between the example phrases. However, I'm inclined to reserve comparison across for cases where more than two things are being compared. Between is used fairly specifically when two things are referred to, and among for more (1,2,3,4,5,6,7,8,9). Across, in its sense of spanning, suggests more than two items.

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