Trends are spotted in the first 48-hour window, in our sample. There is the big open question of validation outside the sample population of course. By precise

Trends are spotted in the first 48-hour window, in our sample. There is the big open question of validation outside the sample population of course. By precise, do you mean precision versus recall? The tradeoff depends on what you want to do with the inferences. If you send the analysis to say a nurse or family member (i.e., human in the loop, which we think is the right approach) then recall should be optimized.