Unqualified use of the word "predicts" is a little bit of a stretch in this editorialized title. The study doesn't predict suicide attempts out of some type of biometric or otherwise observable data or surveillance information, it's predicting it from a self-survey. The actual journal article title tells the story much better: "Using smartphone surveys to predict next-week suicide attempts" https://psycnet.apa.org/do…
I don’t think you realize how often depressed people say they will but don’t commit suicide, and also being able to know when is quite remarkable - I think this study is pretty interesting, and not as obvious as you think it is.
> They were sent brief (20-item) smartphone-based surveys 6 times/day for 3 months
Is that in any way realistic? 120 answers/day??