期刊
STATISTICS & PROBABILITY LETTERS
卷 78, 期 17, 页码 2957-2962出版社
ELSEVIER
DOI: 10.1016/j.spl.2008.05.029
关键词
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The concepts of principal strata direct and indirect effects are compared with and contrasted to definitions of direct and indirect effects which make reference to interventions on intermediate variables. Certain simple relations hold for direct effects but not indirect effects. (C) 2008 Elsevier B.V. All rights reserved.
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