Public school critics often point to rising expenditures and relatively flat test scores to justify their school reform agendas. The claims are flawed because their analyses fail to account for the difference in data types between dollars (ratio) and test scores (interval). A cost-benefit analysis using dollars as a common metric for both costs…

Existing studies from the United States, Latin America and Asia provide scant evidence that private schools dramatically improve academic performance relative to public schools. Using data from Kenya--a poor country with weak public institutions--we find a large effect of private schooling on test scores, equivalent to one full standard deviation.…

Five sister reports published by the Friedman Foundation over the past two years have ignored the relevant research literature in asserting that private-school voucher programs can reduce the social costs of dropping out while increasing graduation rates. The reports are state-specific, targeting five different states. But each report follows a…