"The cost efficiency of 520 New York school districts is measured using data envelopment analysis and stochastic frontier regression. Mean inefficiency is 14% using either method, and the rank order correlation coefficient of inefficiency between the two methods is 86. The three largest school...

It is well known in the Data Envelopment Analysis literature that proper variable selection is necessary for the reliable measurement of efficiency. Omitting production relevant variables and/or including irrelevant variables will lead to biased measurement. It is also known that the sample size...