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…

The value of a program can be understood as referring not only to outcomes, but also to how those outcomes compare to the types and amounts of resources expended to produce the outcomes. Major potential mistakes and biases in assessing the worth of resources consumed, as well as the value of outcomes produced, are explored. Most of these occur…