. Author manuscript; available in PMC: 2009 Sep 14.

Published in final edited form as: J Educ Psychol. 2007 Feb 1;99(1):128–139. doi: 10.1037/0022-0663.99.1.128

Table 3.

Individual-Differences Univariate Model Fitting for the Five Aspects of Mathematics—Genetic (A), Shared Environmental (C), and Nonshared Environmental (E) Parameter Estimates

	A		C		E
Measure	Estimate	CI	Estimate	CI	Estimate	CI
Applic	0.30	0.16, 0.46	0.30	0.16, 0.41	0.41	0.35, 0.47
Underst	0.42	0.24, 0.57	0.15	0.03, 0.29	0.44	0.37, 0.51
Comput	0.42	0.24, 0.54	0.10	0.01, 0.24	0.48	0.41, 0.56
Interp	0.35	0.21, 0.46	0.08	0.01, 0.21	0.56	0.50, 0.63
Non-Num	0.45	0.27, 0.58	0.11	0.01, 0.26	0.44	0.38, 0.51

Note. Three fit indexes are reported: chi-square, Akaike’s information criterion (AIC; Akaike, 1987), and root-mean-square error of approximation (RMSEA). Model fit: χ² (65, N = 756) = 83.197, p = 0.06 (AIC = −46.803, RMSEA = 0.028). The univariate estimates were obtained from the multivariate model fitting, which is reflected in the degrees of freedom. CI = confidence interval; Applic = Mathematical Application category; Underst = Understanding Number category; Comput = Computation and Knowledge category; Interp = Mathematical Interpretation category; Non-Num = Non-Numerical Processes category.