Technical analysis is the use of charts; graphs and stock quote data to determine patterns in the stock market and attempt to predict the future based on the past. This is in essence the same technique used by economists and meteorologists to determine where the economy is headed or what the weather will be like a few days from now. But, we all know how accurate those can be. The problem with looking to the past to predict the future is that there are simply too many variables to account for; the past can never be a perfect predictor of the future. This is the same problem encountered in technical analysis.
The challenge of technical analysis is further compounded by the fact that there are many hundreds of technical indicators available. An indicator is a chart pattern, observation, or mathematical formula that can be applied to or observed on a plot of the opening, closing, high and low prices for a certain number of periods. An example of this would be the moving average convergence divergence indicator discussed in the previous article (Introduction to Trading Strategies). The third problem is that there is no one indicator that is universally applicable. Some indicators are better in certain markets. Some are better with certain stocks. Some are only applicable during certain times of the economic cycle, such as during a downturn. As a result, multiple indicators may be used for a stock, to make sure that they all give the same signal. Because of all of these challenges in using technical analysis, technical indicators are not silver bullets. By themselves, they are very poor indicators of timing, but can provide insight into which stocks warrant more detailed analysis. Below are some of the more common technical indicators used.
Pattern Analysis
This is probably the simplest and the ‘original’ technical analysis. Since the creation of the stock market, there have been visual patterns that have been observed to repeat themselves overtime on graphs of price data. These patterns such as the head and shoulders pattern, the cup and handle pattern or the triangle pattern (to name a few) offer a pretty good indication as to where the stock market is going. They also excel at predicting trend reversals or breakouts, which makes them invaluable.
Relative Strength Index (RSI)
This compares the historical number and magnitude of up and down closes, to more recent ones, hence why it is relative. It compares the strength of the stock over a long time period with the strength of the stock over a shorter and more recent time period, and then ranks the current strength relative to the longer-term strength. An up close is where the closing price is higher than the opening price. A down close is where the closing price is lower than the opening price. An RSI above 70 indicates an overbought condition that is a sell signal. An RSI below 30 indicates an oversold condition, which is a buy signal.
Trend Analysis
Effectively the same method described in the previous article, this method relies on moving averages and the MACD indicator to determine trend strengths and potential trend reversals. This allows the trader to trader to trade with the trend and be reasonably assured of success. When the trend begins to weaken (when the MACD lines start to converge) the trader can exit his position, hopefully locking in a profit.