We define a sample of the dataset as an assessment of a single person at a specific wave t. The corresponding outcome of the sample to predict is the number of falls as reported by the person at wave t + 1. Since each person has participated in up to four waves, there will be up to four samples (and up to three outcomes) for each person. We excluded samples from subjects younger than 65 at the time of the assessment, and samples without information about future falls (e.g. samples from subjects’ final assessments or from subjects who did not respond at wave t + 1). Thus, we obtained 2313 samples from 976 subjects.