Shi, Guanming; Chavas, Jean-Paul; Lauer, Joseph; Nolan, … - In: American Journal of Agricultural Economics 95 (2013) 3, pp. 739-754
We investigate selectivity bias in the evaluation of biotech hybrid productivity. The analysis is applied to experimental data on Wisconsin corn yields from 1990 to 2010. Relying on a Heckman-like factor that accounts for selectivity, we find evidence of selection bias, indicating that some of...