The study dealt with a research environment in which the treatment effect is heterogeneous, and in which individuals use their assessments of the treatment effect to decide whether or not to enroll in an intervention program. In this article, a new methodology is proposed for examining the validity of the specified research environment in a given intervention program and database. The methodology is based on direct examination of the assumptions underlying that research environment. Comparison of the commonly used verification method with the one proposed here revealed that these methods are complementary rather than substitutional.
Abadie, A., J. Angrist, and G. Imbens.2002. Instrumental variables estimates of the effect of subsidized training on the quantiles of trainee earnings. Econometrica70:91-117.
2.
Ahituv, A., Y. Eyal, and L. Cohen.2002. Analysis of changes in employment and wages of unemployed persons in Israel after participation in vocational training courses. Rivon Lekalkala [Economics Quarterly]49:577-601. In Hebrew.
3.
Angrist, J.D., G.W. Imbens, and D.B. Rubin.1996. Identification of casual effects using instrumental variables. Journal of the American Statistical Association91:444-58.
4.
Björklund, A., and R. Moffitt.1987. The estimation of wage gains and welfare gains in self-selection models. Review of Economics and StatisticsLXIX:42-49.
5.
Deaton, A.2010. Instruments, randomization, and learning about development . Journal of Economic Literature48:424-55.
6.
Dehejia, R.H., and S. Wahba.1999. Casual effects in nonexperimental studies: Reevaluating the evaluation of training programs. Journal of the American Statistical Association94:1053-62.
7.
Eyal, Y., and M. Beenstock.2008. Sign reversal in LIVE treatment effect estimates: The effect of vocational training on unemployment duration. Labour Economics15:1102-25.
8.
Heckman, J.1997. Instrumental variables a study of implicit behavioral assumptions used in making program evaluations. Journal of Human Resources32:441-62.
9.
Heckman, J.J.2001. Micro data, heterogeneity, and the evaluation of public policy: Nobel lecture. Journal of Political Economy109:673-748.
10.
Heckman, J., H. Ichimura, J. Smith, and P. Todd.1998. Characterizing selection bias using experimental data. Econometrica66:1017-98.
11.
Heckman, J.J., R.J. Lalonde, and J.A. Smith.1999. The economics and econometrics of active labor market programs. In Handbook of labor economics, 3A, Ch. 31, eds., O. Ashenfelter, and D. Card, 1865-2097. Amsterdam: Elsevier Science.
12.
Heckman, J.J., and R. Robb.1985. Alternative methods for evaluating the impact of interventions. In Longitudinal analysis of labor market data, eds., J. J. Heckman, and B. Singer, 156-245. New York: Cambridge University Press.
13.
Heckman, J.J., D. Schmierer, and S. Urzua.2010. Testing the correlated random coefficient model. Journal of Econometrics158:177-203.
14.
Heckman, J.J., and J. Smith.1998. Evaluating the welfare state. In Econometrics and economics in the 20th century: The Ranger Frisch Centennial Symposium, ed., S. Strom, 241-318. New York: Cambridge University Press for Econometric Society Monograph Series.
15.
Heckman, J.J., J. Smith, and N. Clements.1997. Making the most out of programme evaluations and social experiments: Accounting for heterogeneity in programme impacts . Review of Economic Studies64:487-535.
16.
Heckman, J., J.L. Tobias, and E. Vytlacil.2000. Simple estimators for treatment parameters in a latent variable framework with an application to estimating the returns to schooling. NBER Working Paper Series: no. 7950.
17.
Heckman, J.J., S. Urzua, and E. Vytlacil.2006. Understanding instrumental variables in models with essential heterogeneity. The Review of Economics and Statistics88:389-432.
18.
Imbens, G.W., and J.M. Wooldridge .2009. Recent developments in the econometrics of program evaluation. Journal of Economic Literature47:5-86.
19.
Lalonde, R.J.1986. Evaluating the econometric evaluations of training programs with experimental data. American Economic Review76:604-20.
20.
The Authority for Manpower Planning, Israel Ministry of Industry, Trade and Employment.2001. Follow up studies participants in vocational training courses Annual Folder for 2000. In Hebrew.
