One of the fist things you will learn in any finance class is that the RSI, or Relative Strength Index is your friend when it comes to evaluating the stock market on the whole. The RSI is a ratio, or comparison between the high closing value of "x" number of days and the low closing value of "x" number of days of the stock market or particular stock or index. The RSI attempts to determine when and identify where an overbought or oversold condition exists, or more simply, when the stock market has been over inflated or is under inflated. This information is useful to investors because it allows them a small glimpse into the mechanics of a market and can be used for just one week or compared over a large amount of time like a year or longer.
While the RSI is a handy tool when it is used as a stock analysis package, it should be remembered that if a stock or index's value suddenly shifts up or down, it's tough to really use the RSI on its own to analyze the values until the measurements are allowed some time to average out over time. That's why it's best to use the RSI as a trading tool, not an all out deciding factor.
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