Four-parameter models have received increasing psychometric attention in recent years, as a reduced upper asymptote for item characteristic curves can be appealing for measurement applications such as adaptive testing and person-fit assessment. However, applications can be challenging due to the large number of parameters in the model. In this…

Few school choice evaluations consider students who leave such programs, and fewer still consider the effects of leaving these programs as policy-relevant outcomes. Using a representative sample of students from the citywide voucher program in Milwaukee, Wisconsin, we analyze more than 1,000 students who leave the program during a 4-year period.…

This article contributes to research concerning the determinants of student mobility between public and private schools. The authors analyze a unique set of data collected as part of a new evaluation of Milwaukee's citywide voucher program. The authors find several important patterns. Students who switch from the private to the public sector were…