【求助】英文文献3篇

1.标题：Confounding and Collapsibility in Causal Inference
   作者：S. Greenland, J.M. Robins and Pearl
   出版社：Statistical Science 1999, Vol. 14, No. 1, 29-46
   链接：http://www.jstor.org/stable/2676645
2.标题：Estimating causal effects of treatments in randomized and non randomized studies.
   作者：D.B. Rubin
   出版社：Journal of Educational Psychology, 66,688-701 (1974).
   链接：http://cooley.libarts.wsu.edu/schwartj/Rubin.%20estimating%20causal%20effects.pdf
3.标题：Statistics and causal inference.
   作者：P.W. Holland
   出版社：Journal of the American. Statistical Association, 81,945-970 (1986).
   链接：http://links.jstor.org/sici?sici=0162-1459%2528198612%252981%253A396%253C945%253ASACI%253E2.0.CO%253B2-7

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1 3 篇找到
2篇没有 见附件

不好意思 这是2

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