The nswdemo data frame contains 722 rows and 10 columns.
These data are pertinent to an investigation of the way that
earnings changed, between 1974-1975 and 1978, for an experimental
treatment who were given job training as compared with a control
group who did not receive such training.
The psid1 data set is an alternative non-experimental "control"
group. psid2 and psid3 are subsets of psid1,
designed to be better matched to the experimental data than
psid1. Note also the cps1, cps2 and cps3
datasets (DAAGxtras) that have been proposed as
non-experimental controls.
data(nswdemo)This data frame contains the following columns:
a numeric vector identifying the study in which the subjects were enrolled (0 = Control, 1 = treated).
age (in years).
years of education.
(0 = not black, 1 = black).
(0 = not hispanic, 1 = hispanic).
(0 = not married, 1 = married).
(0 = completed high school, 1 = dropout).
real earnings in 1974.
real earnings in 1975.
real earnings in 1978.
Dehejia, R.H. and Wahba, S. 1999. Causal effects in non-experimental studies: re-evaluating the evaluation of training programs. Journal of the American Statistical Association 94: 1053-1062.
Lalonde, R. 1986. Evaluating the economic evaluations of training programs. American Economic Review 76: 604-620.
Smith, J. A. and Todd, P.E. 2005,"Does Matching overcome. LaLonde?s critique of nonexperimental estimators", Journal of Econometrics 125: 305-353.
Dehejia, R.H. 2005. Practical propensity score matching: a reply to Smith and Todd. Journal of Econometrics 125: 355-364.