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Biases in Twin Estimates of the Return to Schooling.
Peer reviewed Peer reviewed
Neumark, David – Economics of Education Review, 1999
Recent within-twin estimates of schooling returns are considerably higher than existing estimates. This paper shows that small ability differences among twins can yield more upward omitted-ability bias (and more upward bias overall) in the instrumental variables estimate correcting for measurement error than in the standard within-twin estimate.…
Descriptors: Bias, Econometrics, Education Work Relationship, Elementary Secondary Education