Retail sales at major chain stores beat analysts' expectations, rising 4.4% year-over-year in August, according to Thomson Reuters' tally of 23 retailers. Discounters, including Target Corp. and Costco Wholesale Corp., did well as East Coasters stocked up before Hurricane Irene.Shoppers showed resilience last month despite stock market turmoil and Hurricane Irene, although sales at some chains were negatively affected.