When it comes to chart analysis, unusually large and small ranges have a lot of meaning. Measuring the distance between opening and closing price tells you a lot when trends develop or begin to lose momentum. Some specific patterns are excellent gauges of when reversal in the trend is likely to occur.
First a few terms: The “real body” is the range between opening and closing price, shown as a rectangle in the candlestick, which is either white (prices moved up) or black (prices move