China's factory activity was likely flat in October from the previous month, as the manufacturing sector continued to move at two speeds, with advanced manufacturers racing ahead and legacy ones still under pressure. The official manufacturing purchasing managers' index (PMI) is expected to dip to 50 from 50.1 in September, according to the median forecast in a Reuters poll of 23 economists. A reading above 50 signals expansion, while one below 50 indicates contraction.