The Rate of Change (Roc) function measures rate of change relative to previous periods.The function is used to determine how rapidly the data is changing. The factor of 100 is usually used to merely make the numbers easier to interpret or graph. The function can be used to measure the Roc of any data series, such as price or another indicator.

Market Signals

The most popular way to use the indicator is as follows. When indicator is above the 0.5 line, it is a buy signal. If indicator crosses the 0.5 line from above it is a sell signal.

Calculation

Rate Of Change 001

Chart Example

Rate Of Change 002

Implementation and Usage

To initialize Roc indicator use one of the following constructors:

Roc – sets default values: period = 14

Roc(Int32) – sets value for period

Roc(TimeSpan) – sets time period

Use

ROC - property to get current value

Example

Copy

 1// Create new instance
 2Roc roc = new Roc(28);
 3
 4// Number of stored values
 5roc.HistoryCapacity = 2;
 6
 7// Add new data point
 8roc.Add(CurrentPrice);
 9
10// Get indicator value
11double IndicatorValue = roc.ROC;
12// Get previous value
13if (roc.HistoryCount == 2)
14{
15    double IndicatorPrevValue = roc[1];
16}