Are Overbought-Oversold Indicators Reliable Predictors of Short-Term Market Performance – a 100-Week Backtest:
Are Overbought-Oversold Indicators Reliable Predictors of Short-Term Market Performance – a 100-Week Backtest
One of the most popular indicators in many analysts’ toolbox is the overbought-oversold numbers generated by the current RSI.
I have never figured out how to get reliable information from reading charts, although many people apparently find them useful. The same goes for the overbought-oversold indicators. On the other hand, I know that many people believe in these numbers, and every Saturday for over 12 years, I have published these indicators for SPY, DIA, IWM, and QQQ for Terry's Tips subscribers.
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Each week, we average the 2-day, 3-day, and 5-day RSI numbers for these popular ETFs and used the following ranges to determine where the ETF stood at the close on Friday:
Very overbought - an RSI reading of greater than or equal to 85.0
Overbought - greater than or equal to 75.0
Neutral - between 30.0 and 75.0
Oversold - less than or equal to 30.0
Very oversold - less than or equal to 20.0
Extremely oversold – less than or equal to 10.0
I went back and checked the results for the last 100 weeks from my Saturday Reports. Here are the numbers for SPY, perhaps the best measure of “the market:”
Neutral – 47 weeks
Overbought – 16 weeks
Very Overbought – 22 weeks
Oversold – 5 weeks
Very Oversold – 8 weeks
Extremely Oversold – 2 weeks
A little less than half the time (47%), the reading was neutral. In 38% of the weeks, SPY was overbought or very overbought, and in 15% of the weeks, it was in some sort of oversold condition.
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I then checked out how SPY performed for the subsequent seven days. Here are the numbers showing what happened to SPY in the week following the condition reported in each Saturday Report:
When SPY is overbought, the technicians would expect that the market would be weaker in the next week, but just the opposite was true. In fact, in 81% of the weeks when it was overbought, SPY rose in the subsequent week. It also went up in 64% of the weeks when it was very overbought.
Clearly, being overbought or very overbought is an absolutely worthless indicator that the market will be lower in the next week. In fact, in subsequent weeks, for the most part, the market outperformed. If the market rose by the average percentage when it started out either overbought or very overbought every week of the year, it would go up by over 61% for the year. In other words, being overbought or very overbought is an excellent chance to bet on a higher market for the next week (rather than the opposite).
The oversold condition is an entirely different story (based on this 100-week sample). Being oversold or extremely oversold is essentially a meaningless indicator – the market rose or fell in just about the same number of weeks following one of those conditions. However, being very oversold seems to be an excellent indicator of a higher market. In 83% of the weeks when it was very oversold, it rose in the subsequent week. The average market gain in those weeks was 1.21% (62% annualized).
Another interesting result is that anytime SPY is anything except neutral, it is a decent indication that the market will move higher in the next week. Being very oversold is the best positive indicator, but being overbought is almost as good a positive indicator (even though this is absolutely contrary to what many technicians would expect).
Bottom line, if you are trying to get a handle on the likely one-week performance of the market based on the overbought-oversold condition on Friday, you are bound to be disappointed. These indicators just don’t work, except possibly the very oversold indicator.
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Any questions? I would love to hear from you by email (terry@terrystips.com), or if you would like to talk to our guy Seth, give him a jingle at 800-803-4595 and either ask him your question(s) or give him your thoughts. seth@terrystips.com
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Terry
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