UPDATE 1-U.S.-based stock funds post $2.9 bln outflows in week-Lipper

(Adds table, analyst comment, byline) By Luciana Lopez NEW YORK, Dec 11 (Reuters) - U.S.-based stock funds saw net outflows of $2.9 billion through the week ended Dec. 10, data from Thomson Reuters Lipper service showed on Thursday. But, echoing a pattern seen for much of the year, the behavior of investors in mutual funds and exchange-traded funds diverged sharply. Investors in mutual funds, thought to represent the behavior of retail investors, pulled a net $7.8 billion from s