Replication of the results in ‘learning about heterogeneity in returns to schooling’
复制了Koop和Tobias（2004）关于教育回报异质性的研究，验证了其结论：教育回报存在异质性，且最好用二元正态分布建模。
Abstract A recent article (Koop and Tobias, 2004 ) proposes a direct way to characterize the extent of heterogeneity in returns to education. They investigate the adequacy of several competing models and conclude that returns to schooling are heterogeneous and are best modelled as a bivariate normal distribution. The results of this replication paper basically agree with the authors. Copyright © 2005 John Wiley & Sons, Ltd.