AUC went from 0.71 (baseline data) to 0.89 when adding these dynamics to the model.
Time-series features for each item included magnitude/speed/probability of change over time: min, max, mean, sd, percentage unique values, mean square successive difference, probability of acute change, maximum change.
The most important predictor, by far, was the probability of an acute change in the desire to die by suicide: “How intense is your desire to kill yourself right now?“. Probability of acute change in the two other items were number 2 and 3 in importance.
