EconPapers    
Economics at your fingertips  
 

Twins are more different than commonly believed, but made less different by compensating behaviors

Jin-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)
JEL-codes: C23 C24 I14 J13 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: Track citations by RSS feed

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S1570677X18302946
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

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
Bibliographic data for series maintained by Haili He ().

 
Page updated 2020-07-10
Handle: RePEc:eee:ehbiol:v:35:y:2019:i:c:p:18-31