if judging things by their attributes. Take one attribute and run by all things instead of doing one thing and running by all attributes
Early in my career as a professor, I graded students’ essay exams in the conventional way. I would pick up one test booklet at it time and read all the students’ essays in immediate succession, grading them as I went. I would then compute the total and go on to the next student. I eventually noticed that my evaluations of the essays in each booklet were strikingly homogeneous. I began to suspect that my grading exhibited a halo effect, and that the first question I scored had a disproportionate effect on the overall grade. The mechanism was simple: if I had given a high score to the first essay, I gave the student the benefit of the doubt whenever I encountered a vague or ambiguous statement later on. This seemed reasonable … I had told the students that the two essays had equal weight, but that was not true: the first one had a much greater impact on the final grade than the second. This was unacceptable. (p. 83) Kahneman then switched to reading all the different students’ answers to each question. This often left him feeling uncomfortable, because he would discover that his confidence in his judgement became undermined when he later discovered that his responses to the same student’s work were all over the place. Neverthless, he is convinced that his new procedure, which, as he puts it “decorrelates error” is superior.
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