TY  - RPRT
        AU  - Heckman, James J.
AU  - Schmierer, Daniel
        TI  - Tests of Hypotheses Arising in the Correlated Random Coefficient Model
        PY  - 2010/Sep/
        PB  - Institute of Labor Economics (IZA)
        CY  - Bonn
        T2  - IZA Discussion Paper
        IS  - 5205
        UR  - https://www.iza.org/publications/dp5205
        AB  - This paper examines the correlated random coefficient model. It extends the analysis of Swamy (1971, 1974), who pioneered the uncorrelated random coefficient model in economics. We develop the properties of the correlated random coefficient model and derive a new representation of the variance of the instrumental variable estimator for that model. We develop tests of the validity of the correlated random coefficient model against the null hypothesis of the uncorrelated random coefficient model.
        KW  - correlated random coefficient models
KW  - instrumental variables
        ER  -