Stock index futures briefly turned negative before turning higher on Friday after data showed the U.S. economy picked up steam in the fourth quarter, although slightly below expectations.

S&P 500 futures rose 1.7 points and were slightly above fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures rose 10 points, and Nasdaq 100 futures rose 6.25 points.

(Reporting by Chuck Mikolajczak)