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. Author manuscript; available in PMC: 2013 Oct 25.
Published in final edited form as: Soc Sci Res. 2011 Nov 15;41(2):10.1016/j.ssresearch.2011.11.010. doi: 10.1016/j.ssresearch.2011.11.010

Table 1.

Within and Between Family Variation in Schooling: 1995–1996 MIDUS

Ordinary Sibling Sample Fraternal Twin Sample Identical Twin Sample
Variation Within Families 31% 24% 15%
Variation Between Families 69% 75% 85%