Errors in peer grading

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Dr. Luca de Alfaro and Michael Shavlovsky did a study on the factors that influence errors in peer grading. They analyzed 288 assignments with 25,633 submissions and 113,169 reviews conducted with CrowdGrader. They found that large grading errors are generally more closely correlated with hard-to-grade submission, rather than with imprecise students. They also found a clear evidence of tit-for-tat behavior when students give feedback on the reviews they received.

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