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Shame on those Princeton researchers! To get the % of As, they only need to count the number of As and divide that by the total number of grades given. What these researchers are suggesting, though, when they say that figures might not have been counted exactly the same way is that different researches might’ve treated grades in non-traditional courses like independent study projects differently (some counting them, some not). If we hypothetically not count grades for such courses, how much do you think the %s would change?</p>