Devereux, Paul J.; Black, Sandra E.; Salvanes, Kjell G. - School of Economics, University College Dublin - 2007
, the evidence on the effects of birth order on IQ is decidedly mixed. This paper uses a large dataset on the population of … Norway that allows us to precisely measure birth order effects on IQ using both cross-sectional and within-family methods …. Importantly, irrespective of method, we find a strong and significant effect of birth order on IQ, and our results suggest that …