0000000000000000000000000000000000000000 34bb58e1168b152af2028d668b102248a81f8dc2 Qingyuan Zhao <qingyzhao@gmail.com> 1411104325 -0700	commit (initial): First commit. package written in Google.
34bb58e1168b152af2028d668b102248a81f8dc2 64f2b6d542ff887b74fd78176fefece5b9c8e956 Qingyuan Zhao <qingyzhao@gmail.com> 1412555183 -0700	commit: core.R: add standard error computation for ebal and ipw (nr weights)
