Maimonides Rule Redux
Joshua Angrist,
Victor Lavy,
Jetson Leder-Luis and
Adi Shany
No 23486, NBER Working Papers from National Bureau of Economic Research, Inc
Abstract:
We use the discontinuous function of enrollment known as Maimonides Rule as an instrument for class size in large Israeli samples from 2002-2011. As in the 1991 data analyzed by Angrist and Lavy (1999), Maimonides Rule still has a strong first stage. In contrast with the earlier Israeli estimates, however, Maimonides-based instrumental variables estimates using more recent data show no effect of class size on achievement. The new data also reveal substantial enrollment sorting near Maimonides cutoffs, with too many schools having enrollment values that just barely produce an extra class. A modified rule that uses data on students’ birthdays to compute statutory enrollment in the absence of enrollment manipulation also generates a precisely estimated zero. In older data, the original Maimonides Rule is unrelated to socioeconomic characteristics, while in more recent data, the original rule is unrelated to socioeconomic characteristics conditional on a few controls. Enrollment manipulation therefore appears to be innocuous: neither the original negative effects nor the recent data zeros seem likely to be manipulation artifacts.
JEL-codes: C22 C26 C36 I21 I26 J24 (search for similar items in EconPapers)
Date: 2017-06
New Economics Papers: this item is included in nep-lma and nep-ure
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Published as Joshua D. Angrist & Victor Lavy & Jetson Leder-Luis & Adi Shany, 2019. "Maimonides Rule Redux," American Economic Review: Insights, vol 1(3), pages 309-324.
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Journal Article: Maimonides' Rule Redux (2019) 
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