A measure of future U.S. economic growth edged up in the latest week, though the annualized growth rate eased, a research group said on Friday.

The Economic Cycle Research Institute, a New York-based independent forecasting group, said its Weekly Leading Index rose to 121.2 in the week ended Jan 6 from 120.2 the previous week.

The index's annualized growth rate slipped to minus 8.4 percent from minus 8.2 percent a week earlier.