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NL and ND for alpha data set. The mean and standard deviation of the number of latent variables or degree of penalty (NL) and the number of molecular descriptors (ND) used to build the models for the the alpha data set.
| Filter | Regression | NL (mean ± std) | ND (mean ± std) |
| no filter | PLS | 7.01 ± 1.15 | 4728 ± 0 |
| no filter | RR | 93.64 ± 60.34 | 4728 ± 0 |
| PLSfilter | PLS | 7.39 ± 0.80 | 199 ± 69 |
| PLSfilter | RR | 26 ± 22 | 192 ± 85 |
