"Trends off big data" can be very useful in a machine-learning sense, if you want to predict very accurately, but you're ok with being far off when you do make

"Trends off big data" can be very useful in a machine-learning sense, if you want to predict very accurately, but you're ok with being far off when you do make a mistake. They're not very useful at all for designing interventions, which in the end is more what we care about.