I feel like people should separate RenTech and Medallion. RenTech funds which are not Medallion have experienced losses similar to any other . The idea is gre

I feel like people should separate RenTech and Medallion. RenTech funds which are not Medallion have experienced losses similar to any other . The idea is great: looking at past events to understand how a particular event such as a sunny day in Manhattan or what did the Yankees do the night before (and millions of other things) influences the price of a stock. If you have enough data you can go back and test if a signal is really a signal or just random coincidence. But somehow it's not working as well as it sounds on paper, I think one of the reason might be that signals like that are very weak and they fade over time so you need leverage to make sure that you cash in while the signal there (because it's weak and subtle) and also you end up losing a bunch of money by chasing a signal which is on its way out.