DislikedI don't know why I'm bothering to address some comments above but here it goes.
From my testing, momentum oscillators (contrarian indicators like slow stochastics and RSI) and sentiment indicators (like put/call ratios) have the same type of characteristics. For example, a contrarian indicator can work if there is a retracement. But, it may not work in a real change of direction (in other words, when you start to see a change of direction, it's actually a new trend and not a retracement).
Another factor as some of you know is the time...Ignored
Example : difference between an MA and an exponential MA.The signal needed would be much difference in case of big bump. Yet, which one is right or wrong?