NEW YORK (AP) - The stock market is capping a rough month. A slowdown in the economy and corporate earnings weighed on investors. The S&P 500 fell 3 percent in January, its worse monthly performance in a year. Today, the 500 index dipped 26 points, or 1.3 percent, to 1,994. The Dow slumped 252 points, or 1.5 percent, to close at 17,164. The Nasdaq eased 48 points, or 1 percent, to 4,635.