Table 2.
Parameter Estimates and Bias-adjusted 95% Confidence Intervals for the Mixture Submodel f1(X;θ)
| Parameter | Af. Am. F. | Af. Am. M. | Eu. Am. F. | Eu. Am. M. |
|---|---|---|---|---|
| πp | 0.83 (0.82, 0.84) | 0.84 (0.84, 0.85) | 0.88 (0.87, 0.88) | 0.87 (0.87, 0.88) |
| µpw | 3219 (3214, 3225) | 3345 (3339, 3350) | 3423 (3420, 3425) | 3566 (3564, 3568) |
| µpg | 39.75 (39.73, 39.76) | 39.68 (39.66, 39.70) | 40.19 (40.18, 40.20) | 40.08 (40.08, 40.09) |
| σpw | 450 (445, 455) | 462 (458, 466) | 441 (439, 443) | 466 (464, 467) |
| σpg | 1.71 (1.67, 1.74) | 1.77 (1.75, 1.79) | 1.47 (1.46, 1.48) | 1.52 (1.50, 1.53) |
| ρp | 0.25 (0.24, 0.26) | 0.26 (0.24, 0.27) | 0.29 (0.28, 0.29) | 0.33 (0.31, 0.32) |
| πs | 0.17 (0.16, 0.18) | 0.16 (0.15, 0.16) | 0.12 (0.12, 0.13) | 0.13 (0.12, 0.13) |
| µsw | 2653 (2621, 2682) | 2691 (2657, 2718) | 3048 (3035, 3062) | 3112 (3096, 3128) |
| µsg | 36.35 (36.13, 36.59) | 36.06 (35.84, 36.23) | 38.95 (38.87, 39.03) | 38.62 (38.55, 38.71) |
| σsw | 952 (929, 971) | 985 (967, 1008) | 837 (824, 853) | 872 (858, 884) |
| σsg | 5.36 (5.26, 5.48) | 5.51 (5.41, 5.61) | 5.17 (5.07, 5.27) | 5.22 (5.11, 5.31) |
| ρs | 0.49 (0.47, 0.51) | 0.50 (0.48, 0.52) | 0.47 (0.46, 0.48) | 0.50 (0.49, 0.51) |
Source: Table 4 in Fang et al. 2007, p. 480
Af. = African, Eu. = European, Am. = American, F. = Females, M. = Male
for i = p (primary) and s (secondary) subpopulations, πi, µiw, µig, σiw, σig, and ρi are the proportion, the mean birth weight, the mean gestational age, the standard deviation of birth weight, the standard deviation of gestational age, and the correlation between birth weight and gestational age respectively. Birth weight is in grams. Gestational age is in weeks.