Table 4.

Statistical parameters of six QSAR models of xanthone derivatives from BuildQSAR

Model		R	s	Fcalc/Ftable	Q2	SPRESS
	Systematic search
1	qC2, qC4, qC8a	0.789	0.331	3.303	0.356	0.628
2	qC1, qC5, qC7, logP	0.827	0.332	2.698	0.139	0.630
3	qC1, qO10, qC5, qC7, logP	0.886	0.306	2.917	0.022	0.668
	Genetic algorithm
4	qC2, qC4, qC8a	0.789	0.331	3.303	0.356	0.628
5	qC4, qC4a, qC10a, V	0.839	0.321	2.975	0.446	0.710
6	qC1, qC2, qC3, u, logP	0.976	0.144	15.920	0.651	0.390

Abbreviations: QSAR, quantitative structure–activity relationship; u, dipole moment.