baum:http://fmwww.bc.edu/ec/baum.php

wooldridge:http://www.msu.edu/~ec/faculty/wooldridge/wooldridge.html

Dufflo:http://econ-www.mit.edu/faculty/?prof_id=eduflo

Imben:http://elsa.berkeley.edu/~imbens/

cheng hsiao:http://ideas.repec.org/e/phs10.html

pesaran: http://www.econ.cam.ac.uk/faculty/pesaran/

Office of Population Research, Princeton University

: http://data.princeton.edu/

.....抛玉引金，呵呵