It is useful to track stocks where prices are moving in a narrow range - contraction. Our interest is in what may happen once the contraction is over. A sharp move in prices - expansion - can be expected. NR7 days are one such pattern of narrow range. This is a day when the price range is the narrowest in the last seven days - bulls and bears are equally balanced. One of them is going to get an upper hand, leading to expansion in any one direction. Here is a chart for Jindal Saw where an NR7 was followed by a small up move in price. The up move was enough for a swing trader. It is possible that there may be more upside to come.