The Momentum indicator value is defined as the difference between price levels after a specified time period. If for example we take a period of 5, then the Momentum oscillator will be defined as the difference between the current close and the close 5 bars earlier. All negative and positive values are displayed on the chart with a zero line in the middle.
In MetaTrader 4, the Momentum indicator is defined not as the difference, but the correlation between the current price and the price n periods before:
MOMENTUM = CLOSE (i) / CLOSE (i - n) * 100
Where:
Momentum signals:
In order to add Momentum indicator to the active chart in MetaTrader 4, use the "Insert -> Indicators -> Oscillators -> Momentum" menu sequence.
Bullish divergence / bearish convergence is the main Momentum signal:
Main Momentum signal