Developed by George C. Lane in the late 1950s, the Stochastic Oscillator is a momentum indicator that shows the location of the close relative to the high-low range over a set number of periods. According to an interview with Lane, the Stochastic Oscillator "doesn't follow price, it doesn't follow volume or anything like that. It follows the speed or the momentum of price. As a rule, the momentum changes direction before price." As such, bullish and bearish divergences in the Stochastic Oscillator can be used to foreshadow reversals. This was the first, and most important, signal that Lane identified. Lane also used this oscillator to identify bull and bear set-ups to anticipate a future reversal. Because the Stochastic Oscillator is range bound, is also useful for identifying overbought and oversold levels.
%K = (Current Close - Lowest Low)/(Highest High - Lowest Low) * 100
%D = 3-day SMA of %K
Lowest Low = lowest low for the look-back period
Highest High = highest high for the look-back period
%K is multiplied by 100 to move the decimal point two places
The default setting for the
Stochastic Oscillator is 14 periods, which can be days, weeks, months or an intraday timeframe. A 14-period %K would use the most recent close, the highest high over the last 14 periods and the lowest low over the last 14 periods. %D is a 3-day simple
moving average of %K. This line is plotted alongside %K to act as a signal or trigger line.
Click here to download this spreadsheet example.
The Stochastic Oscillator measures the level of the close relative to the high-low range over a given period of time. Assume that the highest high equals 110, the lowest low equals 100 and the close equals 108. The high-low range is 10, which is the denominator in the %K formula. The close less the lowest low equals 8, which is the numerator. 8 divided by 10 equals .80 or 80%. Multiply this number by 100 to find %K %K would equal 30 if the close was at 103 (.30 x 100). The Stochastic Oscillator is above 50 when the close is in the upper half of the range and below 50 when the close is in the lower half. Low readings (below 20) indicate that price is near its low for the given time period. High readings (above 80) indicate that price is near its high for the given time period. The IBM example above shows three 14-day ranges (yellow areas) with the closing price at the end of the period (red dotted) line. The Stochastic Oscillator equals 91 when the close was at the top of the range. The Stochastic Oscillator equals 15 when the close was near the bottom of the range. The close equals 57 when the close was in the middle of the range.
There are three versions of the
Stochastic Oscillator available on SharpCharts. The Fast
Stochastic Oscillator is based on George Lane's original formulas for %K and %D. %K in the fast version that appears rather choppy. %D is the 3-day SMA of %K. In fact, Lane used %D to generate buy or sell signals based on bullish and bearish
divergences. Lane asserts that a %D
divergence is the "only signal which will cause you to buy or sell". Because %D in the Fast
Stochastic Oscillator is used for signals, the Slow
Stochastic Oscillator was introduced to reflect this emphasis. The Slow
Stochastic Oscillator smooths %K with a 3-day SMA, which is exactly what %D is in the Fast
Stochastic Oscillator. Notice that %K in the Slow
Stochastic Oscillator equals %D in the Fast
Stochastic Oscillator (chart 2).
Fast
Stochastic Oscillator:
Slow
Stochastic Oscillator:
The Full
Stochastic Oscillator is a fully customizable version of the Slow
Stochastic Oscillator. Users can set the look-back period, the number of periods to slow %K and the number of periods for the %D moving average. The default parameters were used in these examples: Fast
Stochastic Oscillator (14,3), Slow
Stochastic Oscillator (14,3) and Full
Stochastic Oscillator (14,3,3).
Full
Stochastic Oscillator:
As a
bound oscillator, the
Stochastic Oscillator makes it easy to identify overbought and oversold levels. The
oscillator ranges from zero to one hundred. No matter how fast a security advances or declines, the
Stochastic Oscillator will always fluctuate within this range. Traditional settings use 80 as the overbought threshold and 20 as the oversold threshold. These levels can be adjusted to suit analytical needs and security characteristics. Readings above 80 for the 20-day
Stochastic Oscillator would indicate that the underlying security was trading near the top of its 20-day high-low range. Readings below 20 occur when a security is trading at the low end of its high-low range.
Before looking at some chart examples, it is important to note that overbought readings are not necessarily bearish. Securities can become overbought and remain overbought during a strong uptrend. Closing levels that are consistently near the top of the range indicate sustained buying pressure. In a similar vein, oversold readings are not necessarily bullish. Securities can also become oversold and remain oversold during a strong downtrend. Closing levels consistently near the bottom of the range indicate sustained selling pressure. It is, therefore, important to identify the bigger trend and trade in the direction of this trend. Look for occasional oversold readings in an uptrend and ignore frequent overbought readings. Similarly, look for occasional overbought readings in a strong downtrend and ignore frequent oversold readings.
Chart 3 shows Yahoo! (YHOO) with the Full
Stochastic Oscillator (20,5,5). A longer look-back period (20 days versus 14) and longer moving averages for smoothing (5 versus 3) produce a less sensitive
oscillator with fewer signals. Yahoo was trading between 14 and 18 from July 2009 until April 2010. Such trading ranges are well suited for the
Stochastic Oscillator. Dips below 20 warn of oversold conditions that could foreshadow a bounce. Moves above 80 warn of overbought conditions that could foreshadow a decline. Notice how the
oscillator can move above 80 and remain above 80 (orange highlights). Similarly, the
oscillator moved below 20 and sometimes remained below 20. The indicator is both overbought AND strong when above 80. A subsequent move below 80 is needed to signal some sort of reversal or failure at resistance (red dotted lines). Conversely, the
oscillator is both oversold and weak when below 20. A move above 20 is needed to show an actual upturn and successful support test (green dotted lines).
Chart 4 shows Crown Castle (CCI) with a breakout in July to start an uptrend. The Full
Stochastic Oscillator (20,5,5) was used to identify oversold readings. Overbought readings were ignored because the bigger trend was up. Trading in the direction of the bigger trend improves the odds. The Full
Stochastic Oscillator moved below 20 in early September and early November. Subsequent moves back above 20 signaled an upturn in prices (green dotted line) and continuation of the bigger uptrend.
Chart 5 shows Autozone (AZO) with a support break in May 2009 that started a downtrend. With a downtrend in force, the Full
Stochastic Oscillator (10,3,3) was used to identify overbought readings to foreshadow a potential reversal. Oversold readings were ignored because of the bigger downtrend. The shorter look-back period (10 versus 14) increases the sensitivity of the
oscillator for more overbought readings. For reference, the Full
Stochastic Oscillator (20,5,5) is also shown. Notice that this less sensitive version did not become overbought in August, September and October. It is sometimes necessary to increase sensitivity to generate signals.
Divergences form when a new high or low in price is not confirmed by the
Stochastic Oscillator. A bullish
divergence forms when price records a lower low, but the
Stochastic Oscillator forms a higher low. This shows less downside momentum that could foreshadow a bullish reversal. A bearish
divergence forms when price records a higher high, but the
Stochastic Oscillator forms a lower high. This shows less upside momentum that could foreshadow a bearish reversal. Once a
divergence takes hold, chartists should look for a confirmation to signal an actual reversal. A bearish
divergence can be confirmed with a support break on the price chart or a
Stochastic Oscillator break below 50, which is the centerline. A bullish
divergence can be confirmed with a resistance break on the price chart or a
Stochastic Oscillator break above 50.
50 is an important level to watch. The
Stochastic Oscillator moves between zero and one hundred, which makes 50 the centerline. Think of it as the 50 yard line in football. The offense has a higher chance of scoring when it crosses the 50 yard line. The defense has an edge as long as it prevents the offense from crossing the 50 yard line. A
Stochastic Oscillator cross above 50 signals that prices are trading in the upper half of their high-low range for the given look-back period. This suggests that the cup is half full. Conversely, a cross below 50 means prices are trading in the bottom half of the given look-back period. This suggests that the cup is half empty.
Chart 6 shows International Gaming Tech (IGT) with a bullish
divergence in February-March 2010. Notice how the stock moved to a new low, but the
Stochastic Oscillator formed a higher low. There are three steps to confirming this higher low. The first is a signal line cross and/or move back above 20. A signal line cross occurs when %K (black) crosses %D (red). This provides the earliest entry possible. The second is a move above 50, which puts prices in the upper half of the
Stochastic range. The third is a resistance breakout on the price chart. Notice how the
Stochastic Oscillator moved above 50 in late March and remained above 50 until late May.
Chart 7 shows Kohls (KSS) with a bearish
divergence in April 2010. The stock moved to higher highs in early and late April, but the
Stochastic Oscillator peaked in late March and formed lower highs. The signal line crosses and moves below 80 did not provide good early signals in this case because KSS kept moving higher. The
Stochastic Oscillator moved below 50 for the second signal and the stock broke support for the third signal. As KSS shows, early signals are not always clean and simple. Signal line crosses, moves below 80 and moves above 20 are frequent and prone to whipsaw. Even after KSS broke support and the
Stochastic Oscillator moved below 50, the stock bounced back above 57 and the
Stochastic Oscillator bounced back above 50 before the stock continued sharply lower.
George Lane identified another form of
divergence to predict bottoms or tops. A bull set-up is basically the inverse of a bullish
divergence. The underlying security forms a lower high, but the
Stochastic Oscillator forms a higher high. Even though the stock could not exceed its prior high, the higher high in the
Stochastic Oscillator shows strengthening upside momentum. The next decline is then expected to result in a tradable bottom. Chart 8 shows Network Appliance (NTAP) with a bull set-up in June 2009. The stock formed a lower high as the
Stochastic Oscillator forged a higher high. This higher high shows strength in upside momentum. Remember that this is a set-up, not a signal. The set-up foreshadows a tradable low in the near future. NTAP declined below its June low and the
Stochastic Oscillator moved below 20 to become oversold. Traders could have acted when the
Stochastic Oscillator moved above its signal line, above 20 or above 50. Alternatively, NTAP subsequently broke resistance with a strong move.
A bear set-up occurs when the security forms a higher low, but the
Stochastic Oscillator forms a lower low. Even though the stock held above its prior low, the lower low in the
Stochastic Oscillator shows increasing downside momentum. The next advance is expected to result in an important peak. Chart 9 shows Motorola (MOT) with a bear set-up in November 2009. The stock formed a higher low in late-November and early December, but the
Stochastic Oscillator formed a lower low with a move below 20. This showed strong downside momentum. The subsequent bounce did not last long as the stock quickly peaked. Notice that the
Stochastic Oscillator did not make it back above 80 and turned down below its signal line in mid December.
While momentum oscillators are best suited for trading ranges, they can also be used with securities that trend, provided the trend takes on a zigzag format. Pullbacks are part of uptrends that zigzag higher. Bounces are part of downtrends that zigzag lower. In this regard, the Stochastic Oscillator can be used to identify opportunities in harmony with the bigger trend.
The indicator can also be used to identify turns near support or resistance. Should a security trade near support with an oversold Stochastic Oscillator, look for a break above 20 to signal an upturn and successful support test. Conversely, should a security trade near resistance with an overbought Stochastic Oscillator, look for a break below 80 to signal a downturn and resistance failure.
The settings on the Stochastic Oscillator depend on personal preferences, trading style and timeframe. A shorter look-back period will produce a choppy oscillator with many overbought and oversold readings. A longer look-back period will provide a smoother oscillator with fewer overbought and oversold readings.
Like all technical indicators, it is important to use the Stochastic Oscillator in conjunction with other technical analysis tools. Volume, support/resistance and breakouts can be used to confirm or refute signals produced by the Stochastic Oscillator.
As noted above, there are three versions of the
Stochastic Oscillator available as an indicator on SharpCharts. The default settings are as follows: Fast
Stochastic Oscillator (14,3), Slow
Stochastic Oscillator (14,3) and Full
Stochastic Oscillator (14,3,3). The look-back period (14) is used for the basic %K calculation. Remember, %K in the Fast
Stochastic Oscillator is unsmoothed and %K in the Slow
Stochastic Oscillator is smoothed with a 3-day SMA. The "3" in the Fast and Slow
Stochastic Oscillator settings (14,3) sets the moving average period for %D. Chartists looking for maximum flexibility can simply choose the Full
Stochastic Oscillator to set the look-back period, the smoothing factor for %K and the moving average for %D. The indicator can be placed above, below or behind the actual price plot. Placing the
Stochastic Oscillator behind the price allows users to easily match indicator swings with price swings.
Click here for a live example.
Stochastic Oscillator Oversold Upturn: This scan starts with stocks that are trading above their 200-day moving average to focus on those in a bigger uptrend. Of these, the scan then looks for stocks with a
Stochastic Oscillator that turned up from an oversold level (below 20).
Stochastic Oscillator Overbought Downturn: This scan starts with stocks that are trading below their 200-day moving average to focus on those in a bigger downtrend. Of these, the scan then looks for stocks with a
Stochastic Oscillator that turned down after an overbought reading (above 80).
