Exchange traded funds continued sliding Thursday. Wall Street analysts lowered their forecasts as companies reported second-quarter results this week that are failing to meet expectations. Bank of America/Merrill Lynch lowered its S&P 500 earnings per share estimate to $102 for this year, down from $103.50, and 2013 earnings are projected to come in at $109 a share, down from $110.50. The forecast implies growth of 4% and 7%, respectively.