I use analytic scoring for my exams (although I am a fan of holistic grading, I rarely take the time to develop the kind of rubrics required to grade--and to communicate to students how I graded). I generally use a points-off approach to decide on partial credit. Exam grades are based on standard percentages (90% and above is an A, etc.), but the percentages are figured out of the high score on the exam, rather than the total points possible. Usually the high score is nearly equal to the total points possible, so this doesn't change things too much. I find though that this protects me a bit if the exam is too long, although after many years of practice, I am getting pretty good at judging exam length.

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