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If you act thoughtfully on all the suggestions implied by Paul’s class (and the cited papers), people will actually believe your IV results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . APRIL FOOLS! @paulgp/1377685285602013184