TABLE 18.
BETWEEN-DOMAIN MULTIVARIATE GENETIC ANALYSES: BIVARIATE GENETIC (A), SHARED ENVIRONMENT (C), AND NONSHARED ENVIRONMENT (E) ESTIMATES AND BIVARIATE A, C, AND E CORRELATIONS (95% CIS IN PARENTHESES)
| A (axayrA/rP) | C (cxcyrC/rP) | E (exeyrE/rP) | rA | rC | rE | |
|---|---|---|---|---|---|---|
| 7-year tests | ||||||
| 1. g | Biv a21–2: .62 (.52–.73) | Biv c21–2: .30 (.20–.39) | Biv e21–2: .08 (.06–.11) | rA1–rA2: . .47 (.40–.55) | rC1–rC2: .63 (.45–.85) | rE1–rE2: .14 (.10–.19) |
| 2. TOWRE | ||||||
| 7-year NC | ||||||
| 1. English | Biv a21–2: .69 (.63–.75) | Biv c21–2: .20 (.14–.26) | Biv e21–2: .11 (.10–.13) | rA1–rA2: .78 (.76–.80) | rC1–rC2: 1.00 (.97–1.00) | rE1–rE2: .40 (.36–.43) |
| 2. Mathematics | ||||||
| 9-year NC | ||||||
| 1. English | Biv a21–2: .73 (.64–.82) | Biv c21–2: .14 (.06–.23) | Biv e21–2: .13 (.11–.15) | rA1–rA2: .79 (.76–.83) | rC1–rC2: 1.00 (.81–1.00) | rE1–rE2: .40 (.35–.46) |
| 2. Mathematics | Biv a21–3: .69 (.60–.79) | Biv c21–3: .17 (.08–.26) | Biv e21–3: .14 (.12–.16) | rA1–rA3: .78 (.74–.83) | rC1–rC3: 1.00 (.78–1.00) | rE1–rE3: .46 (.41–.51) |
| 3. Science | Biv a22–3: .72 (.62–.81) | Biv c22–3: .15 (.06–.23) | Biv e22–3: .14 (.11–.16) | rA2–rA3: .82 (.79–.86) | rC2–rC3: 1.00 (.85–1.00) | rE2–rE3: .41 (.36–.46) |
| 10-year tests | ||||||
| 1. g | Biv a21–2: .51 (.38–.63) | Biv c21–2: .39 (.28–.50) | Biv e21–2: .10 (.06–.14) | rA1–rA2: .63 (.52–.76) | rC1–rC2: .85 (.68–.99) | rE1–rE2: .17 (.11–.23) |
| 2. PIAT | Biv a21–3: .59 (.48–.70) | Biv c21–3: .30 (.20–.40) | Biv e21–3: .11 (.08–.14) | rA1–rA3: .76 (.66–.86) | rC1–rC3: .84 (.66–.99) | rE1–rE3: .22 (.16–.28 |
| 3. Web mathematics | Biv a22–3: .49 (.36–.63) | Biv c22–3: .41 (.29–.51) | Biv e22–3: .10 (.06–.15) | rA2–rA3: .52 (.43–.64) | rC2–rC3: 1.00 (.77–1.00) | rE2–rE3: .16 (.09–.21) |
| 10-year NC | ||||||
| 1. English | Biv a21–2: .60 (.52–.69) | Biv c21–2: .26 (.18–.33) | Biv e21–2: .14 (.12–.16) | rA1–rA2: .79 (.75–.82) | rC1–rC2: 1.00 (.94–1.00) | rE1–rE2: .45 (.40–.50) |
| 2. Mathematics | Biv a21–3: .52 (.44–.61) | Biv c21–3: .33 (.25–.40) | Biv e21–3: .15 (.13–.18) | rA1–rA3: .78 (.74–.82) | rC1–rC3: 1.00 (.95–1.00) | rE1–rE3: .51 (.46–.56) |
| 3. Science | Biv a22–3: .55 (.47–.64) | Biv c22–3: .29 (.20–.36) | Biv e22–3: .16 (.14–.19) | rA2–rA3: .80 (.76–.84) | rC2–rC3: 1.00 (.95–1.00) | rE2–rE3: .49 (.44–.54) |
Note.—NC, National Curriculum; TOWRE, Test of Word Reading Efficiency; PIAT, Peabody Individual Achievement Test.