What is Stochastic Oscillator?
Definition
The stochastic oscillator is a momentum indicator that compares a stock's closing price to its price range over a specified period. It oscillates between 0 and 100, identifying overbought conditions above 80 and oversold conditions below 20.
Detailed Explanation
The stochastic oscillator was developed by George Lane in the 1950s. It consists of two lines: %K (the fast line) measures the current close relative to the high-low range over a lookback period (typically 14), and %D (the slow line) is a 3-period moving average of %K.
The indicator is based on the observation that in uptrends, closing prices tend to close near the high of the range, and in downtrends, near the low. A reading above 80 suggests the price is closing near the top of its recent range (overbought), while below 20 suggests it is closing near the bottom (oversold).
Trading signals include %K crossing above %D in the oversold zone (bullish) and %K crossing below %D in the overbought zone (bearish). Divergence between the oscillator and price is also significant—if price makes a new high but the stochastic does not, momentum is weakening.
The stochastic oscillator works best in ranging markets. In strong trends, the indicator can remain overbought or oversold for extended periods, producing premature signals.
Formula
%K = (Close - Lowest Low) / (Highest High - Lowest Low) x 100Example
Over the last 14 days, a stock's high was $110, low was $90, and today's close is $105. %K = ($105 - $90) / ($110 - $90) x 100 = 75. The stock is closing in the upper portion of its recent range.
Frequently Asked Questions
Is overbought the same as overvalued?
What are the best stochastic settings?
How does the stochastic differ from RSI?
Related Terms
MACD (Moving Average Convergence Divergence)
MACD is a trend-following momentum indicator that shows the relationship between two exponential moving averages of price. It generates signals through crossovers of the MACD line and signal line, zero-line crossovers, and divergences with price.
Bollinger Bands
Bollinger Bands are a technical analysis tool consisting of a middle band (20-period SMA) and two outer bands set at two standard deviations above and below the middle band. They dynamically adjust to volatility, widening during volatile periods and narrowing during calm periods.
Support and Resistance
Support and resistance are price levels where a stock historically tends to stop falling (support) or stop rising (resistance). These levels form because of concentrated buying or selling interest and are foundational concepts in technical analysis.
Average True Range (ATR)
Average True Range is a volatility indicator that measures the average range of price movement over a specified period, accounting for gaps. It is used for position sizing, stop-loss placement, and assessing market volatility.
See It in Action
Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute investment advice. AI-generated analysis may contain errors or inaccuracies. Always conduct your own research and consult a qualified financial advisor before making investment decisions.
See Stochastic Oscillator in Action
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