Stochastic – EFS

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
n KSmoothing	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 variables
var 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 variables
var xStudy1 = null;
var xStudy2 = null;
var bInit = false; // Initialization flag
function 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 variables
var xStudy1 = null;
var xStudy2 = null;
var bInit = false; // Initialization flag
function 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));
}