Rates were little changed Wednesday in volatile trading. This morning, the Chicago PMI manufacturing index fell to 56.5, beating forecast. Payroll firm ADP estimated a net gain of 91,000 private sector jobs in August ahead of this Friday’s Employment Report, a bit less than expected. Factory Orders rose 2.4%, led by the transportation component. Stocks moved higher. The Mortgage Bankers Association weekly purchase activity index increased by 0.9%, while the refinancing activity index decreased by 12.2%. Average reported 30-year fixed rates fell to 4.32%, not including fees. No other key data will be released today.