Joshua D. Angrist , Alan B. Krueger 【文题(必填)】The Effect of Age at School Entry on Educational Attainment: An Application of Instrumental Variables with Moments from Two Samples 【年份(必填)】
《Journal of the American Statistical Association》 , 1992 , 87 (418) :328-336 【全文链接或数据库名称(选填)】http://xueshu.baidu.com/s?wd=pap ... 1890019706807800791
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