On Tuesday, February 14, investors await Congressional testimony from Federal Reserve Chairwoman Janet Yellen and Credit Suisse's (CS) latest earnings. Yellen is speaking before the Senate Banking Committee in a semiannual address. She is expected to update lawmakers on the health of the economy and the path of interest rates going forward. The speech starts at 10 a.m. EST. Credit Suisse, Discovery Communications (DISCB) and Molson Coors (TAP) are all on the earnings calendar for Tuesday. As for economic data, the producer price index for January is released at 8:30 a.m. TheStreet's Scott Gamm reports from Wall Street.