Mortgage rates were little changed Tuesday following the release of mixed economic data. December Retail Sales jumped 0.5% led by increased auto sales, beating expectations. The Producer Price Index (PPI) fell 0.2%, below the consensus of -0.1%, and was 1.3% higher than one year ago. Core PPI, which excludes volatile food and energy components, rose 0.1%, and was a tame 2.0% higher year-over-year. The Empire State Index, a survey of manufacturing activity in the region, came in a -7.8, well below forecast. Readings below zero indicate contraction in the manufacturing sector. Stocks moved lower. No other key data will be released today.