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Direct linkKristensen, Petter; Bjerkedal, Tor – Intelligence, 2010
This register-based longitudinal study of 392 969 Norwegians examined associations between birth order, gender and educational attainment at age 25 years within families (fixed effects regression) and between families (ordinary OLS regression). Data were retrieved from national registers for births of mothers with single births only and a first…
Descriptors: Educational Attainment, Birth Order, Foreign Countries, Longitudinal Studies
Bjerkedal, Tor; Kristensen, Petter; Skjeret, Geir A.; Brevik, John I. – Intelligence, 2007
The present paper reports the results of a within and between family analysis of the relation between birth order and intelligence. The material comprises more than a quarter of a million test scores for intellectual performance of Norwegian male conscripts recorded during 1984-2004. Conscripts, mostly 18-19 years of age, were born to women for…
Descriptors: Foreign Countries, Males, Siblings, Marital Status
