UPDATE 1-U.S.-based stock funds attract $6.1 bln over week -Lipper

(Adds details on additional flows, analyst comment, table) By Sam Forgione NEW YORK, Aug 28 (Reuters) - Investors in U.S.-based funds poured $6.1 billion into stock funds and $672 million into high-yield bond funds in the week ended Aug. 27 on continued appetite for risk assets, data from Thomson Reuters' Lipper service showed on Thursday. The inflows into stock and high-yield bond funds, while down from the previous week, marked the third straight week of new demand for both fund ca