Table 2.
ROC statistics for SVM classifiers of cognitive group using different sets of observations.
| Set | Set | Group | AUC | σAUC | TPR | σTPR | 1-FPR | dFPR |
|---|---|---|---|---|---|---|---|---|
| vols | 1 | C | 92.7 | 7.9 | 93.6 | 13.8 | 90.5 | 7.4 |
| 1 | aMCI | 75.6 | 15.5 | 70.0 | 34.0 | 82.2 | 13.5 | |
| 1 | ADD | 90.0 | 12.6 | 84.5 | 21.3 | 91.1 | 7.9 | |
| T2mad | 2 | C | 93.1 | 9.5 | 87.3 | 12.8 | 93.3 | 5.1 |
| 2 | aMCI | 64.5 | 13.2 | 38.2 | 42.3 | 87.2 | 16.8 | |
| 2 | ADD | 65.5 | 26.1 | 57.4 | 43.0 | 86.6 | 12.2 | |
| High-T2 | 3 | C | 94.6 | 4.2 | 90.6 | 8.5 | 93.6 | 5.6 |
| 3 | aMCI | 77.1 | 12.5 | 62.6 | 33.5 | 85.2 | 13.9 | |
| 3 | ADD | 85.3 | 14.4 | 86.1 | 23.8 | 85.6 | 10.5 | |
| DTImad | 4 | C | 88.0 | 11.1 | 78.3 | 19.1 | 89.6 | 7.4 |
| 4 | aMCI | 68.5 | 12.5 | 36.9 | 32.6 | 91.7 | 10.3 | |
| 4 | ADD | 81.7 | 10.6 | 64.3 | 19.2 | 90.4 | 8.8 | |
| Cog | 5 | C | 95.3 | 3.4 | 94.2 | 6.1 | 93.0 | 4.8 |
| 5 | aMCI | 79.5 | 12.1 | 61.7 | 31.5 | 88.2 | 12.2 | |
| 5 | ADD | 89.6 | 5.0 | 87.5 | 8.1 | 90.7 | 6.6 | |
| allMRI | 1,2,3,4 | C | 95.2 | 6.6 | 98.4 | 9.4 | 93.1 | 7.8 |
| 1,2,3,4 | aMCI | 81.0 | 17.4 | 79.0 | 32.2 | 85.6 | 12.1 | |
| 1,2,3,4 | ADD | 88.8 | 9.7 | 94.5 | 13.5 | 86.1 | 10.7 | |
| best | 1,3,5 | C | 97.5 | 6.9 | 99.2 | 6.7 | 97.0 | 6.7 |
| 1,3,5 | aMCI | 82.2 | 15.3 | 87.7 | 23.9 | 83.2 | 12.3 | |
| 1,3,5 | ADD | 87.1 | 13.5 | 87.4 | 19.6 | 86.7 | 11.5 | |
AUC = area under curve, σAUC = standard deviation of AUC, TPR = true positive rate (sensitivity), σTPR = standard deviation of TPR, FPR = false positive rate (1-specificity). These are given as the mean of a group-balanced leave-out-one wrt smallest group procedure ± the standard deviation, as percentages.