The Dow Jones Industrial Average dipped 21.44 points, or 0.13 percent, to 16,391.99. The S&P 500 edged down 0.05 point, or less than 0.01 percent, to 1,917.78. The Nasdaq Composite Index rose 16.89 points, or 0.38 percent, to 4,504.43, Xinhua news agency reported.