Table 6.

Validation of the MLR models.

Training Set	R 2	F	RMS	Test Set	R 2	F	RMS
Group 1
A + B + C + D	0.829	51.697	0.192	T	0.917	13.820	0.222
A + B + C + T	0.735	30.457	0.261	D	0.874	48.592	0.153
B + C + D + T	0.742	31.565	0.255	A	0.795	27.199	0.217
A + C + D + T	0.723	28.775	0.259	B	0.889	55.784	0.173
A + B + D + T	0.744	31.912	0.247	C	0.835	35.501	0.217
Average	0.755	34.881	0.243		0.862	36.180	0.196
Group 2
A + B + C + D	0.803	76.016	0.222	T	0.852	51.678	0.193
A + B + C + T	0.802	75.661	0.225	D	0.748	38.559	0.256
B + C + D + T	0.784	67.805	0.235	A	0.857	78.133	0.193
A + C + D + T	0.786	68.459	0.233	B	0.818	58.416	0.221
A + B + D + T	0.780	66.184	0.235	C	0.831	63.981	0.218
Average	0.791	70.834	0.230		0.821	58.153	0.216
Group 3
A + B + C + D	0.789	13.720	0.260	T	0.733	260.404	0.380
A + B + C + T	0.760	29.502	0.263	D	0.927	63.850	0.115
B + C + D + T	0.755	27.787	0.254	A	0.899	53.612	0.170
A + C + D + T	0.762	28.869	0.250	B	0.917	66.385	0.159
A + B + D + T	0.754	27.573	0.248	C	0.846	32.957	0.237
Average	0.764	25.490	0.255		0.864	95.442	0.212