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Stochastic Oscillator

imageThe Stochastic Oscillator Technical Indicator compares where a security’s price closed relative to its price range over a given time period. The Stochastic Oscillator is displayed as two lines. The main line is called %K. The second line, called %D, is a MovingAverage of %K. The %K line is usually displayed as a solid line and the %D line is usually displayed as a dotted line.

There are several ways to interpret a Stochastic Oscillator. Three popular methods include:

   Buy when the Oscillator (either %K or %D) falls below a specific level (e.g., 20) and then rises above that level. Sell when the Oscillator rises above a specific level (e.g., 80) and then falls below that level;

   Buy when the %K line rises above the %D line and sell when the %K line falls below the %D line;

   Look for divergences. For instance: where prices are making a series of new highs and the Stochastic Oscillator is failing to surpass its previous highs.

Calculation

The Stochastic Oscillator has four variables:

   %K periods. This is the number of time periods used in the stochastic calculation;

   %K Slowing Periods. This value controls the internal smoothing of %K. A value of 1 is considered a fast stochastic; a value of 3 is considered a slow stochastic;

   %D periods. his is the number of time periods used when calculating a moving average of %K;

   %D method. The method (i.e., Exponential, Simple, Smoothed, or Weighted) that is used to calculate %D.

The formula for %K is:
%K = (CLOSE-LOW(%K))/(HIGH(%K)-LOW(%K))*100
Where:
CLOSE — is today’s closing price;
LOW(%K) — is the lowest low in %K periods;
HIGH(%K) — is the highest high in %K periods.

The %D moving average is calculated according to the formula:
%D = SMA(%K, N)
Where:
N — is the smoothing period;
SMA — is the Simple Moving Average.

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