Documents Greenberg, David H. 2 results

"When evaluating a pilot or demonstration program, there are risks from drawing inferences from a single test. This paper reviews the experiences of replication efforts from demonstrations using randomized controlled trials in the initial evaluation and the replications. Although replications of promising programs are primarily gathered to increase sample size, replications are also used to learn if the intervention is successful for other target groups and geographic locations, and to vary some of the intervention's features. In many cases, replications fail to achieve the same success as the original evaluation, and the paper reviews reasons that have been suggested for such failures. The paper reviews what has been learned from replications where random assignment was used in six instances: income maintenance experiments, unemployment insurance bonus experiments, the Center for Employment Training program, job clubs, job search experiments, and the Quantum Opportunity Program. The paper concludes by summarizing lessons learned from the review and areas where more research is needed."

"This study uses meta-analysis to synthesize findings from 31 evaluations of 15 voluntary government-funded training programs for the disadvantaged that operated between 1964 and 1998. On average, the earnings effects of the evaluated programs seem to have been largest for women, quite modest for men, and negligible for youths. For men and women, the earnings effects of training appear to have persisted for at least several years after the training was complete. Classroom skills training was apparently effective in increasing earnings, but basic education was not. There is no evidence that more expensive training programs performed better than less expensive ones. Although the United States has more than three decades of experience in running training programs, the programs do not appear to have become more effective over time."