Citation: J. Heckman et E. Vytlacil, Identifying the role of cognitive ability in explaining the level of and change in the return to schooling, REV ECON ST, 83(1), 2001, pp. 1-12
Citation: J. Heckman et E. Vytlacil, Instrumental variables methods for the correlated random coefficient model- Estimating the average rate of return to schooling when the return is correlated with schooling, J HUM RES, 33(4), 1998, pp. 974-987