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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Intelligence. 2018 Mar 16;68:58–65. doi: 10.1016/j.intell.2018.03.003

Table 6.

Within Subject and Within-Family Correlations of ELC Scores

GEE Correlations Pearson Correlations
r Standard Error P-value r P-value
Same Child Over Time 0.30 0.05 1.97E-09 0.30 1.00E-11
Twins Same Age 0.70 0.06 < 2.2E-16 0.78 < 2.2E-16
Siblings Same Age 0.41 0.22 0.06 0.45 1.51E-04