Social Science & Medicine · 2016 · 195 citations · 47 references
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Sample Selection Bias as a Specification Error
James J. Heckman · Econometrica · 1979 · 28.9K citations
Testing for unit roots in heterogeneous panels
Kyung So Im, M. Hashem Pesaran, Yongcheol Shin · Journal of Econometrics · 2003 · 15K citations · Full text
Data Archiving and Networked Services (DANS) · 2015 · 6.8K citations