Stochastic

ICE Data Services -

stochK(), stochD() Built-in Study Functions

The Stochastic is designed to indicate when the market is overbought or oversold. It is based on the premise that when a market's price increases, the closing prices tend to move toward the daily highs and, conversely, when a market's price decreases, the closing prices move toward the daily lows. A Stochastic displays two lines, %K and %D. %K is calculated by finding the highest and lowest point in a trading period and then finding where the current close is in relation to that trading range, %K is then smoothed with a moving average. %D is a moving average of %K.

Syntax
stochK(  nKLength , nKSmoothing , nDLength [, Series | sym() | inv() ][, nBarIndex ] )
stochD( nKLength , nKSmoothing , nDLength [, Series | sym() | inv() ][, nBarIndex ] )

Parameters
Parameter: Description: Default:
nKLength Required. Number of periods to use for the fastK calculation.

 

n/a nKSmoothing Required. Number of periods to use for the %K smoothing calculation.

 

n/a nDLength Required. Number of periods to use for the fastD calculation.

 

n/a Series or
sym() or
inv()
[Optional]  Series Object or function of sym() or inv() to determine symbol/interval source for the study.

 

Chart's sym/inv nBarIndex [Optional]  Bar index of series to retrieve.

 

n/a


Return Value(s)

Returns a Series Object when nBarIndex is not specified.

Returns a single value when nBarIndex is specified.


Notes
Only available in versions 7.9 or later.

Code Examples
Single Line Indicator:
function main() {    return new Array(stochK(14, 1, 3),                      	          stochD(14, 1, 3) );}

Single Line Study-on-Study Indicator:
function main() {    return new Array(stochK(14, 1, 3, hl2()),                      stochD(14, 1, 3, hl2()) );}

Retrieve single values:
function main() {    var nValue_0 = stochD(14, 1, 3, 0);  // Current Bar Index    var nValue_1 = stochD(14, 1, 3, -1); // Prior Bar Index             return new Array(nValue_0, nValue_1);}

Initialize Series Objects:
//global Series Object variablesvar xStudy1 = null;var xStudy2 = null;function main() {    if (xStudy1 == null) xStudy1 = stochK(14, 1, 3);    if (xStudy2 == null) xStudy2 = stochD(14, 1, 3);            // retrieve single values for conditional statements    var nValue1_0 = xStudy1.getValue(0);  // Current Bar Index value    var nValue2_0 = xStudy2.getValue(0);  // Current Bar Index value    var nValue1_1 = xStudy1.getValue(-1); // Prior Bar Index value        // Plot Current Bar Index Value        return new Array(nValue1_0, nValue2_0);  }

Initialize a Series Object based on an external interval:
// global Series Object variablesvar xStudy1 = null;var xStudy2 = null;var bInit = false;  // Initialization flagfunction main() {    if (bInit == false) {        xStudy1 = stochK(14, 1, 3, inv(20));   // 20-min interval        xStudy2 = stochD(14, 1, 3, inv(20));  // 20-min interval        bInit = true;    }            // retrieve single values for conditional statements    var nValue1_0 = xStudy1.getValue(0);  // Current Bar Index value    var nValue1_1 = xStudy1.getValue(-1); // Prior Bar Index value            // Synchronized Series plot    return new Array(getSeries(xStudy1),                     getSeries(xStudy2) );  }


Initialize a Series Object based on an external symbol and interval:
// global Series Object variablesvar xStudy1 = null;var xStudy2 = null;var bInit = false;  // Initialization flagfunction main() {    if (bInit == false) {        xStudy1 = stochK(14, 1, 3, sym("IBM,20"));   // IBM 20-min interval        xStudy2 = stochD(14, 1, 3, sym("IBM,20"));  // IBM 20-min interval        bInit = true;    }            // retrieve single values for conditional statements    var nValue1_0 = xStudy1.getValue(0);  // Current Bar Index value    var nValue1_1 = xStudy1.getValue(-1); // Prior Bar Index value            // Synchronized Series plot    return new Array(getSeries(xStudy1),                     getSeries(xStudy2) );  }


See Also
Series Object
getSeries()
Built-in Study Functions
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