Table 2.
Feature ranking for F-score and forward feature selection
| Rank | F-score | Forward feature selection |
|---|---|---|
| 1 | FAQ (NP) | FAQ (NP) |
| 2 | ADAS 13 (NP) | ADAS 13 (NP) |
| 3 | ADAS 11 (NP) | RIGHTHIPPO (VOLUME) |
| 4 | AVEASSOC (PET) | X2SDSIGPXL (PET) |
| 5 | BCVOMIT (BLSYMP) | ADAS 11 (NP) |
| 6 | TAU (BIO) | SUMZ3 (PET) |
| 7 | X2SDSIGPXL (PET) | SUMZ2 (PET) |
| 8 | MIDTEMP (VOLUME) | LEFTHIPPO (VOLUME) |
| 9 | AVEREF (PET) | DIGITSCOR (NP) |
| 10 | NXHEEL (EXAMS) | AVEASSOC (PET) |
Abbreviations: FAQ, Functional Activities Questionnaire; ADAS, Alzheimer's Disease Assessment Score; AVEASSOC, average regional association cortex value; X2SDSIGPXL/X3SDSIGPXL, number of pixels with Z-scores ≥ 2/3 standard deviations; SUMZ2/SUMZ3, sum of pixel Z-scores ≥ 2/3 standard deviations; BCVOMIT, vomiting; NXHEEL, cerebellar—heel to shin; MIDTEMP, volume of middle temporal lobe; LEFTHIPPO/RIGHTHIPPO, volume of left and right hippocampus; AVEREF, average regional value of the reference region used for normalization; DIGITSCOR, Digit Symbol Substitution Test.