Table 27. Models for fetal blood flow to the placenta (mL/min vs. fetal mass in g for power law models, mL/min vs. gestational age in weeks for all other models).

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	4.716	—	—	—	-1343.40	2688.80
Quadratic Growth	-2.1512	0.21963	—	—	-1092.25	2188.49
Cubic Growth	-12.892	0.95321	-0.011962	—	-1066.27	2138.54
Gompertz	2.4281×10−5	1.6159	0.098127	—	-1065.14	2136.28
Logistic	262.20	0.22183	28.784	—	-1059.02	2124.04
Power Law	0.59874	0.74324	—	—	-1070.75	2145.51
Luecke Power Law	6.1120×10−4	2.6388	-0.12945	—	-1064.47	2134.93

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.