Investors often hear that one stock is "overbought," or another is "oversold." How do experts arrive at those conclusions, and how can investors learn to do their own analysis of a stock's valuation? There's the price-to-earnings ratio (P/E), price/earnings to growth ratio (PEG), and price to book value, among others. These ratios and values help form a fundamental perspective, but several other numbers can help determine valuation from a technical perspective. These include the Relative Strength Indicator (RSI), the stochastic oscillator, and the Commodity Channel Index (CCI). Although the complicated names can sound perplexing, they're all quite simple and easy to read on a chart, and they all show the same thing: whether a given equity is overbought or oversold. Relative Strength Index (RSI) The Relative Strength Index (RSI) is a momentum indicator that compares the magnitude of a stock's recent gains to the magnitude of its recent losses...