Lamb Weston ( LW - Free Report ) has been on a downward spiral lately with significant selling pressure. After declining 17% over the past four weeks, the stock looks well positioned for a trend reversal as it is now in oversold territory and there is strong agreement among Wall Street analysts that the company will report better earnings than they predicted earlier. Guide to Identifying Oversold Stocks We use Relative Strength Index (RSI), one of the most commonly used technical indicators, for spotting whether a stock is oversold. This is a momentum oscillator that measures the speed and change of price movements. RSI oscillates between zero and 100. Usually, a stock is considered oversold when its RSI reading falls below 30. Technically, every stock oscillates between being overbought and oversold irrespective of the quality of their fundamentals. And the beauty of RSI is that it helps you quickly and easily check if a stock's price is reaching a point of reversal.