By Victor Reklaitis and Carla Mozee, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks drifted slightly lower in early action Friday, with investors awaiting Federal Reserve Chairwoman Janet Yellen's speech at a high-profile gathering of the world's central bankers.

The S&P 500(SPX) fell 2.34 points, or 0.1%, to 1,990.03, while the Dow Jones Industrial Average(DJI) lost 22.44 points, or 0.1%, to 17,017.05. The Nasdaq Composite(RIXF) lost 3.44 points to trade at 4,528.66

But barring a Friday shake-up, the three main indexes are on track to log weekly advances. Thursday's session ended with the S&P 500 marking its 28th record close this year, the Dow finishing above 17,000 for the first time since July 24 and the Nasdaq ending at its highest level since March 31, 2000. The S&P 500 up 1.7% for the week, the Dow is up 2.1% and the Nasdaq up 1.4%.

Dovish comments expected in Jackson Hole: Yellen, at her speech at the annual gathering of central bankers in Jackson Hole, Wyo., is expected to focus on the labor market and sound dovish. Her remarks are slated to begin at 10 a.m. Eastern. Yellen has previously outlined the lineup of indicators she's watching to gauge the health of the labor market, including wages and the number of people working part time who want to work full-time.

The "hawkish noises coming out of the recent [Fed] meeting minutes will add extra spice to what Yellen has to say," said Richard Perry, market analyst at Hantec Markets, in a Friday note. "It would be surprising if she did anything other than hold a steady ship and that the Fed will maintain an accommodative monetary policy for a considerable period of time."

Minutes of the Fed's meeting in July, released this week, showed senior officials are becoming increasingly divided on how fast the labor market is improving. But many Fed policy makers believe more improvement is needed before they begin raising interest rates.

Several regional Fed presidents, including San Francisco Fed President John Williams and St. Louis Fed President James Bullard, are also offering their own views on the central bank's policies. Bullard said there is some slack in the labor market, but it isn't significant. Also set to speak Friday is European Central Bank President Mario Draghi at 2:30 p.m. Eastern. Beyond the central bankers talking, there are no major U.S. economic reports on Friday's schedule.

Stocks to watch: Women's apparel retailer Ann Inc. (ANN) posted second-quarter earnings and sales that topped analysts expectations, but offered muted third-quarter guidance. Shares fell 5.3%.

Aéropostale Inc. (ARO) shares dropped nearly 8% after the clothing retailer's forecast a wider-than-expected loss for the fiscal third quarter.

Apple Inc. (AAPL) shares were little changed. The company's suppliers are struggling to get enough screens ready for the launch of the bigger-screened iPhone 6 next month, according to a report by Reuters, citing unnamed sources.

On the upside, Foot Locker Inc. (FL) shares jumped 4.2% after the athletic shoe retailer's second-quarter results came in better than Wall Street anticipated.

Ross Stores Inc. (ROST) gained more than 6% as second-quarter earnings at the discounter rose 12%. Ross also raised its full-year earnings projection.

GameStop Corp. (GME) shares climbed 8.3% after the videogame retailer's third-quarter earnings forecast outpaced estimates.

(Read more about the day's big movers here http://www.marketwatch.com/story/gamestop-soars-aeropostale-sinks-foot-locker-reports-earnings-friday-2014-08-21.)

Other markets: Oil futures (CLV4) slipped and gold futures (GCZ4) edged up. In Asia overnight, Japan's Nikkei Average broke a nine-session winning streak, and in Europe, the Stoxx 600 was slightly lower.

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