Older and wiser? Birth order and IQ of young men

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dc.contributor.author Devereux, Paul J.
dc.contributor.author Black, Sandra E.
dc.contributor.author Salvanes, Kjell G.
dc.date.accessioned 2008-12-11T16:47:53Z
dc.date.available 2008-12-11T16:47:53Z
dc.date.copyright The Institute for the Study of Labor (IZA) 2007 en
dc.date.issued 2007-08
dc.identifier.uri http://hdl.handle.net/10197/740
dc.description.abstract While recent research finds strong evidence that birth order affects children’s outcomes such as education and earnings, 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 earlier born children have higher IQs. Our preferred estimates suggest differences between first-borns and second-borns of about one fifth of a standard deviation or approximately 3 IQ points. Despite these large average effects, birth order only explains about 3% of the within-family variance of IQ. When we control for birth endowments, the estimated birth order effects increase. Thus, our analysis suggests that birth order effects are not biologically determined. Also, there is no evidence that birth order effects occur because later-born children are more affected by family breakdown. en
dc.description.sponsorship National Science Foundation; California Center for Population Research (CCPR); The Research Council of Norway en
dc.format.extent 4304 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Institute for the Study of Labor en
dc.relation.ispartofseries IZA Discussion Paper Series en
dc.relation.ispartofseries No. 3007 en
dc.subject Birth order en
dc.subject IQ en
dc.subject.classification I2 en
dc.subject.classification J1 en
dc.subject.lcsh Young men--Intelligence levels en
dc.subject.lcsh Birth order--Norway en
dc.subject.lcsh Intelligence levels--Norway en
dc.title Older and wiser? Birth order and IQ of young men en
dc.type Working Paper en
dc.internal.authorurl Paul J. Devereux (web page) en
dc.internal.authorurl http://www.ucd.ie/research/people/economics/professorpauldevereux/ en
dc.internal.authorid UCD0006 en
dc.internal.availability Full text available en
dc.internal.webversions Publisher's version en
dc.internal.webversions http://ftp.iza.org/dp3007.pdf en
dc.status Not peer reviewed en
dc.neeo.contributor Black|Sandra E.|aut|
dc.neeo.contributor Devereux|Paul J.|aut|UCD0006
dc.neeo.contributor Salvanes|Kjell G.|aut|


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