Table 1.

Solubility data: average prediction error estimates

Number of test objects	Average number of principal components	ave.PE internal	ave.PE  ± std	ave.PE oracle ± std
2	3.79	0.70	1.05 ± 0.04	1.03 ± 0.01
12	3.68	0.69	1.10 ± 0.03	1.11 ± 0.01
22	3.26	0.71	1.16 ± 0.03	1.18 ± 0.01
32	2.81	0.76	1.26 ± 0.03	1.28 ± 0.01