The buy signal was on wednesday, from the cboe put call ratio for equities at .80. In a bull market, go long when that number is over .70, in a bear of course, wait for that number to be over 1 before calling a bottom.
BTW, best indicators for market action are CRB and Weekly leading indicators. Both are saying sell, sell, sell. But my gut is fed is not really tightening yet, they may wait until Trump is on the ropes, and then tighten to screw economy and get him out of office. My gut is he is not out until economy starts to fail, then GOP will have no reason to keep him around. Then Pence is pres, and we are really screwed!