It is a greater likelihood of an event happening over an event not happening.
Here's the set setup from this morning. I traded TNA long from right before it went to new highs. It stalled out so I took profits and shorted it. Some good momo for a few candles then it stalled again. I didn't go long but only waited because the short momo seemed strong.
Lo and behold I saw a doji appear on the QQQQ at the 11:15 candle. That said the probability of it dropping more was greater than not. So I took TNA short, FAZ VXX long resulting in profitable trades. No other reasons. NO thinking.
First chart is QQQQ. Screen capture is a few candles late. Red lines are support/resistance lines I draw on when I start which not coincidentally is right where the doji appeared.
Second chart is TNA short
Third chart is TNA cover