Inefficiency, subsample selection bias, and nonrobustness

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Industrial Relations Section, Dept. of Economics, Princeton University, 2004 - Education - 11 pages
"This article responds to Peterson and Howell's (PH's) defense of their voucher research. We show that PH's rationales for excluding some 815 students, more than 40% of their sample, because they lacked baseline data in a randomized experiment are unconvincing"--P. 718.

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