CPC versus QQQQ on 3 Year Daily Chart. This chart will update. Watch the 5 and 10 day sma's:
The more days in a row the put to call ratio prints over 1.0 this the more likely a bottom will be a strong one. Trips above the green horizontal line may align with buying opportunities. Below the red line? That's a clear sell and it has not happened in years.
Closes of the put to call ratio sma's below 0.50 and sometimes a bit above are indicative of a short term top. Watch the simple moving averages as well because periods of too much buying of puts or calls will almost certainly bring about market bottoms and tops respectively.