US STOCKS-Wall St edges higher, on track for third weekly gain
* Priceline and Hewlett-Packard both beat expectations
* Groupon shares tumble after forecasting loss
* Existing home sales fall to 18-month low in Jan
* Indexes up: Dow 0.2 pct, S&P 0.2 pct, Nasdaq 0.3 pct
By Ryan Vlastelica
NEW YORK, Feb 21 (Reuters) - U.S. stocks edged higher on Friday, with the S&P 500 within grasp of record levels in the wake of strong results at Priceline, though investors found little reason to push shares solidly higher following a recent rally.
Traders continued to watch the political situation in Ukraine, with EU mediators expecting an agreement between Ukraine's pro-European opposition and Russian-backed President Viktor Yanukovich, though the former was seeking last-minute changes to the deal.
Geopolitical concerns may take on a bigger role next week, when there will be few U.S. earnings and data releases to otherwise drive trading.
A report showed existing home sales fell more than expected to an 18-month low in January, the latest metric to indicate softness, though many analysts pin the weakness to weather instead of worsening fundamentals. Continuación...