(CNBC) U.S. stocks closed narrowly mixed Thursday, with investors looking ahead to U.S. GDP data and comments from Federal Reserve Chair Janet Yellen.
Yellen is expected to answer questions Friday afternoon as she receives an award at Harvard University.
"I expect her to say some pretty dovish things, but I may be in the minority," said Randy Warren, chief investment officer at Warren Financial, adding he does not expect the U.S. central bank to hike next month. "We don't have the growth rate [to hike]."
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