By Victor Reklaitis, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks edged up on Friday and aimed for their third straight weekly advance. Another weaker-than-expected economic report, this one for existing-home sales in January, was blamed on the especially harsh winter and didn't dent sentiment.

The S&P 500 (SPX) was last up 5 points, or 0.3%, to 1,845, led by utilities and materials. The benchmark index is on pace for a weekly gain of 0.4%.

The Dow Jones Industrial Average (DJI) rose 41 points, or 0.3%, to 16,174, with Microsoft Corp. (MSFT), Nike Inc. (NKE) and McDonald's Corp. (MCD) faring best among Dow components and all up more than 1%. The blue-chip index showed a 0.1% advance for the week.

The Nasdaq Composite (RIXF) added 14 points, or 0.3%, to 4,282. The tech-heavy index is on track for a weekly advance of 0.9%.

All three indexes are working on a third straight weekly gain. Stocks have bounced back from a slump in late January and early February, putting the S&P 500 just below its Jan. 15 record close of 1,848.38.

Investors lately have looked past a slew of disappointing economic reports, attributing them to the particularly bad winter weather that's hit much of the U.S. On Friday, existing-home sales in January showed a bigger-than-expected decline, but unusually poor weather may have played a role, the National Association of Realtors said.

But there is a challenge presented by how stock investors have reacted to weak data, according to Steven Wieting, global chief investment strategist for Citi Private Bank.

Markets "that have looked over the valley to a stronger period of U.S. growth ahead, may not have to 'tilt up' when that recovery from weather-related weakness becomes apparent," Wieting said in a client note on Friday.

Nonetheless, Citi Private Bank still predicts moderate gains for U.S. stocks. Wieting said his bank's "expectation for a roughly 7% gain in U.S. market earnings per share, low interest rates and growing dividends leaves us expecting further U.S. market gains, if more modest than 2013."

Follow MarketWatch's live blog of Friday's stock-market action

On Thursday, U.S. stocks closed higher, as traders found encouragement in data showing U.S. manufacturing activity jumped to its highest level in almost four years, shrugging off downbeat reports from the Philadelphia Federal Reserve, China and Europe.

Two Federal Reserve speakers were scheduled to speak later Friday. Dallas Fed President Richard Fisher is slated to talk at 12:45 p.m. Eastern, while St. Louis Fed President James Bullard will speak at 1:10 p.m.

Among individual stocks, Groupon Inc. (GRPN) slid 16% after the daily-deals company late Thursday delivered a disappointing outlook.

Hewlett-Packard Co. (HPQ) fell 1.2%, as the PC and printers maker cut short an early rally on its upbeat results.

Priceline.com Inc. (PCLN) climbed 3.2% after late Thursday reported fourth-quarter results that exceeded expectations.

In other financial markets, European stock markets traded higher, following a mostly upbeat session in Asia. Metals prices rose, while oil prices suffered as the dollar gave up gains against major rivals.

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