The Nationally Supported Work (NSW) experimental data set by Lalonde (1986).
LaLonde, R. J. (1986), ``Evaluating the econometric evaluations of training programs with experimental data". The American Economic Review, pp. 604<U+2013>620.
Dehejia, R., and Wahba, S. (1999), ``Causal effects in nonexperimental studies: Reevaluating the evaluation of training programs", Journal of the American Statistical Association, 94(443), 1053<U+2013>1062.
https://users.nber.org/~rdehejia/nswdata.html
Chattopadhyay, A., Morris, C. N., and Zubizarreta, J. R. (2020), ``Randomized and Balanced Allocation
of Units into Treatment Groups Using the Finite Selection Model for R".