FIGURE 1.

Overlapping cognitive variables. Overlap between test and subtest level neuropsychological variables across the four harmonization cohorts (top) and the AIBL Validation cohort (bottom). Regions shaded white are variables that were collected in a given cohort, regions shaded black are variables that are not collected in a given cohort and are imputed using k‐NN imputation. ADAS‐Cog, Alzheimer's Disease Assessment Scale Cognitive subscale; ADNI, Alzheimer's Disease Neuroimaging Initiative; AIBL, Australian Imaging, Biomarker & Lifestyle Flagship Study of Ageing; BACS, Berkeley Aging Cohort Study; BNT, Boston Naming Test; CDR, Clinical Dementia Rating; DSPAN, Digit Span; (H/C/R)VLT, Hopkins/California/Rey Verbal Learning Tests; INECO, Institute of Cognitive Neurology Frontal Screening; k‐NN, k‐nearest neighbors; LM, Logical Memory; MINT, Multilingual Naming Test; MOCA, Montreal Cognitive Assessment; NIMROD, Neuroimaging of Inflammation in Memory and Related Other Disorders study; NUS, National University of Singapore; RCFT, Rey Complex Figure Test; WAIS, Wechsler Adult Intelligence Scale