	Five parameter models			Four parameter models						Three parameter models
				Overall statistics
Model	VG1	FX	Omuto	VG2	Gard	D.expo	Ruso	BC	Kosugi	MB	Tani	Campbel
RSE	0.0106	0.0166	0.0099	0.0123	0.0134	0.0200	0.0287	0.0535	0.0375	0.0241	0.0292	0.1112
r²	0.9956	0.9891	0.9958	0.9940	0.9929	0.9844	0.9677	0.8869	0.9448	0.9785	0.9688	0.4899
EF	0.9955	0.9891	0.9958	0.9940	0.9929	0.9844	0.9675	0.8868	0.9448	0.9785	0.9688	0.4736
Correlation (r²) for Subsoil
Model	VG1	FX	Omuto	VG2	Gard	D.expo	Ruso	BC	Kosugi	MB	Tani	Campbel
Africa	0.9932	0.9964	0.9947	0.9931	0.9896	0.9824	0.9719	0.8678	0.9649	0.9764	0.9722	0.3736
C. America	0.9982	0.9564	0.9955	0.9973	0.9952	0.9776		0.9005	0.9998	0.9110	0.8610	0.2614
S. America	0.9945	0.9923	0.9936	0.9922	0.9921	0.9847	0.9523	0.8397	0.8296	0.9800	0.9761	0.3031
Europe	0.9954	0.9573	0.9948	0.9935	0.9929	0.9806	0.9548	0.7879	0.9330	0.9732	0.9553	0.0015
N. Asia	0.9926	0.9910	0.9923	0.9899	0.9898	0.9825	0.9868	0.9134	0.9598	0.9749	0.9604	0.9515
S. Asia	0.9953	0.9896	0.9987	0.9903	0.9884	0.9585	0.7872	0.8745	0.8340	0.9396	0.8990	0.3563
M. East	0.9989	0.9979	0.9978	0.9977	0.9927	0.9779	0.9615	0.8075	0.8090	0.9481	0.9067	0.5617
Correlation (r²) for Topsoil
Model	VG1	FX	Omuto	VG2	Gard	D.expo	Ruso	BC	Kosugi	MB	Tani	Campbel
Africa	0.9955	0.9960	0.9929	0.9919	0.9908	0.9844	0.9711	0.8580	0.9369	0.9706	0.9596	0.6117
C. America	0.9948	0.9920	0.9835	0.9888	0.9924	0.9342	0.8353	0.9454	0.9760	0.9722	0.9487	0.7219
S. America	0.9973	0.9976	0.9950	0.9935	0.9857	0.9801	0.9463	0.8166	0.8975	0.9624	0.9395	0.8226
Europe	0.9971	0.8734	0.9961	0.9942	0.9955	0.9644	0.8693	0.7890	0.8711	0.9579	0.9275	0.4374
N. Asia	0.9972	0.9969	0.9991	0.9968	0.9947	0.9863	0.9688	0.8927	0.8708	0.9736	0.9550	0.5899
S. Asia	0.9943	0.9875	0.9986	0.9883	0.9872	0.9486	0.7800	0.8362	0.8344	0.9307	0.8754	0.7562
M. East	0.9962	0.9941	0.9977	0.9731	0.9716	0.9571	0.8018	0.8613	0.8434	0.9210	0.8915	0.7763