US STOCKS-Wall St edges down as factory data adds to growth worries
* China factory activity at 6-1/2-yr low in September
* U.S. factory activity stays at 2-yr low in September
* Materials and energy sectors lag
* Indexes down: Dow 0.3 pct, S&P 0.2 pct, Nasdaq 0.1 pct (Updates to late afternoon)
By Caroline Valetkevitch
Sept 23 (Reuters) - U.S. stocks were down slightly in late trading on Wednesday after weak Chinese and U.S. factory data added to global demand worries.
Trading was once again choppy, with the S&P 500 briefly trading higher in the afternoon following comments by Chinese President Xi Jinping that his country was capable of maintaining a relatively high growth rate for a long time.
U.S. manufacturing growth stayed at a two-year low in September, while Chinese factory activity shrank to a 6-1/2 year low in the month.
The S&P materials index was down 1.8 percent, leading the decline for the S&P 500, followed by the energy index, which was down 1 percent. Continuación...