Thursday's midday trade: Wall Street down

US stocks dipped in choppy trade on Thursday as investors grappled with uncertainty in the eurozone, a raft of corporate earnings and economic data that painted a mixed picture of the domestic recovery. The Dow Jones industrial average dropped 29.45 points, or 0.23 percent, at 13,003.30. The Standard & Poor's 500 Index was down 3.48 points, or 0.25 percent, at 1,381.66. The Nasdaq Composite Index took off 1.70 points, or 0.06 percent, at 3,029.75.