Dr Fox effect
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Dr. Fox effect is a correlation observed between teacher expressiveness, content coverage, student evaluation and student achievement.
In the observation, two equivalent groups of students are given lectures varying in content coverage. After the lecture, students are required to evaluate the teacher on effectiveness. A test is also taken to measure the student achievement.
It is observed that student achievement is higher for higher content-coverage. However students are observed to rate high content-coverage lectures as better than low-coverage lectures only under conditions of low expressiveness. Under conditions of high expressiveness, no correlation is observed.
This lack of correspondence between content-coverage and ratings under conditions of high expressiveness is known as the Dr Fox Effect.[1]
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