Table 3. Comparison of R2 values of four models by type and by total fertility rate (TFR) level.

TFR		Power	Exponential	Logarithmic	Polynomial	TFR
Low	Armenia	0.966	0.892	0.939	0.874	1.7
	Colombia	0.946	0.920	0.965	0.928	2.0
	India	0.968	0.789	0.880	0.834	2.2
Medium	Egypt	0.985	0.900	0.892	0.861	3.5
	Ghana	0.977	0.932	0.888	0.868	4.2
	Pakistan	0.980	0.878	0.856	0.829	3.8
High	Tanzania	0.962	0.953	0.901	0.894	5.2
	Uganda	0.966	0.965	0.859	0.841	5.4
	Nigeria	0.969	0.907	0.811	0.798	5.5