Table 30. Fetal hematocrit models (percentage vs. gestational age in weeks).

Model	${\widehat{\mathit{\theta }}}_0$	${\widehat{\mathit{\theta }}}_1$	${\widehat{\mathit{\theta }}}_2$	${\widehat{\mathit{\theta }}}_3$	$\mathcal{l}\left(\widehat{\mathit{\theta }}\right)$	AIC
Linear Growth	1.5067	—	—	—	-17.65	37.29
Quadratic Growth	2.1113	-0.020268	—	—	-15.99	35.98
Cubic Growth	4.5061	-0.18487	0.0026766	—	-15.13	36.27
Gompertz	1.4852	0.37866	0.10624	—	-16.33	38.36
Logistic	48.265	0.18901	15.372	37.316	-16.92	39.85
Power Law	11.579	0.18622	—	—	-16.65	37.29
Luecke Power Law	9.8655	0.27410	-0.0091527	—	-16.20	38.41

For each model considered, the maximum likelihood parameter estimates ($\widehat{\theta }$), log-likelihood ($\mathcal{l}\left(\widehat{\theta }\right)$), and AIC are provided. The row describing the selected model is shown in boldface.