Investors often turn to recommendations made by Wall Street analysts before making a Buy, Sell, or Hold decision about a stock. While media reports about rating changes by these brokerage-firm employed (or sell- side) analysts often affect a stock's price, do they really matter? Before we discuss the reliability of brokerage recommendations and how to use them to your advantage, let's see what these Wall Street heavyweights think about Schlumberger (SLB) . Schlumberger currently has an average brokerage rec ...