# Rate of Change (ROC) Rate of change: the percent change of the source over N bars, momentum expressed in percent so it compares across markets. ## How to read it - Positive values: price is up over the window; negative: down. - Extreme readings show stretched moves that may slow down. - Crosses of the zero line mark momentum shifts. ## Key settings - Length 9, source close. ## Good to know - Drawn in its own pane below the chart.