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Does private tutoring improve students’ National College Entrance Exam performance?—A case study from Jinan, China[J] . Yu Zhang.Economics of Education Review . 2013
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Selection on Observed and Unobserved Variables: Assessing the Effectiveness of Catholic Schools[J] . Joseph G. Altonji,Todd E. Elder,Christopher R. Taber.Journal of Political Economy . 2005 (1)
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The Economic Costs of Conflict: A Case Study of the Basque Country[J] . Alberto Abadie,Javier Gardeazabal.The American Economic Review . 2003 (1)
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Revisiting the Quantitative-Qualitative Debate: Implications for Mixed-Methods Research[J] . Joanna E. M. Sale,Lynne H. Lohfeld,Kevin Brazil.Quality and Quantity . 2002 (1)
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Causal Effects in Nonexperimental Studies: Reevaluating the Evaluation of Training Programs[J] . Rajeev H. Dehejia,Sadek Wahba.Journal of the American Statistical Association . 1999 (448)