 Twins are more different than commonly believed, but made less different by compensating behaviorsJin-Young Choi and Myoung-jae Lee Economics & Human Biology, 2019, vol. 35, issue C, 18-31 Abstract: Twin studies are popular, because twins are believed to be the same/similar in genes and environmental exposures. It is well documented, however, that the firstborns are healthier at birth. We use the entire U.S. record of twin births during 1995–2000 to show that the survival duration parameters differ between twins depending on the birth order. We also find that wiser (i.e., older or educated) or married (i.e., resource-richer) mothers take more care of the weaker, which is a “compensating” behavior reducing the twin difference, as opposed to “reinforcing (the twin difference)” behavior. The systematic survival pattern difference and the mother's intervention against nature send cautions to twin studies that regard twins homogeneous to interpret their findings accordingly. Since the survival duration in our data is 97% right-censored in one year, we devise a quantile-based ‘fixed-effect’ semiparametric estimator that can handle heavy censoring, which is our methodological contribution. Keywords: Twin study; Birth-order effect; Compensating behavior; Heavy censoring; Quantiles (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:ehbiol:v:35:y:2019:i:c:p:18-31 DOI: 10.1016/j.ehb.2019.03.007 Access Statistics for this article Economics & Human Biology is currently edited by J. Komlos, Inas R Kelly and Joerg Baten More articles in Economics & Human Biology from Elsevier |
Is your work missing from RePEc? Here is how to contribute.
Questions or problems? Check the EconPapers FAQ or send mail to .
EconPapers is hosted by the
School of Business at Örebro University.