In trading on Tuesday, shares of the PowerShares Active U.S. Real Estate Fund ETF ( PSR) entered into oversold territory, changing hands as low as $69.932 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of PowerShares Active U.S. Real Estate Fund, the RSI reading has hit 27.6 — by comparison, the RSI reading for the S&P 500 is currently 47.7. A bullish investor could look at PSR's 27.6 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), PSR's low point in its 52 week range is $63.72 per share, with $79.54 as the 52 week high point — that compares with a last trade of $69.94. PowerShares Active U.S. Real Estate Fund shares are currently trading down about 2.5% on the day.