UPDATE 1-US-based stock funds attract $8.8 bln over week, all in ETFs

(Adds analyst comments, table, byline) By Luciana Lopez NEW YORK, Oct 30 (Reuters) - Investors in U.S.-based funds added a net $8.8 billion to stock funds in the week ended Oct. 29, the largest amount since the week ended Aug. 20, data from Thomson Reuters' Lipper service showed on Thursday. The net inflows were entirely in money that poured into stock exchange traded funds, which saw net inflows of $9.7 billion in the week. In contrast, stock mutual funds saw net outflows of $947 mi