Maimonides' rule
Rule used to evaluate the effect of class size on student test scores
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Through Standard deviation
Joshua Angrist and Victor Lavy (1999) have used "the nonlinear relationship between the local number of students and the class size predicted by Maimonides' rule to estimate the impact of class size on student performance, and evaluate the effect of being just below the number of students for whom an additional teacher would be brought up, and of being just above this number."
Their results have shown highly irregular patterns in class size that are precisely mirrored in student achievement. They have found that a reduction in predicted class size of ten students is associated with a 0.25 standard deviation increase in fifth-graders' test scores.