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Table 9 Top selected features using the ensemble approach with CCC data (RPT threshold with β set as 10). Ranking positions of each feature are reported within brackets for the 2,3, and 4 years time windows, respectively

From: Neuropsychological predictors of conversion from mild cognitive impairment to Alzheimer’s disease: a feature selection ensemble combining stability and predictability

Common features across all time windows

 Forgetting Index (1,1,1)

Verbal Paired-Associate Learning – Difficult (10,11,11)

 Verbal Paired-Associate Learning – Total (2,2,2)

Verbal Paired-Associate Learning – Easy (11,10,10)

 Cancelation Task – A’s time (3,4,6)

Word Recall (Total) (12,12,12)

 Logical Memory Immediate A free recal (4,3,5)

Orientation (Total) (13,14,14)

 Age (first symptoms) (5,8,7)

Raven Progressive Matrices (15,14,14)

 Category Fluency (6,5,4)

Years of formal education (16,17,16)

 Age (7,6,3)

Word Recall – Free recall (18,19,19)

 Logical Memory A with Interference- free recall (8,7,9)

Cancelation Task – A’s total (19,18,18)

 Logical Memory A Immediate Cued (9,9,8)

Common features across one or two time windows

 Interpretation of proverbs - (Verbal Abstraction) (17,-,20)

Calculation (19,-,-)

 Information (−,16,17)

Orientation – Temporal (20,20,-)