A measure of future U.S. economic growth slipped in the latest week, a research group said on Friday.

The Economic Cycle Research Institute, a New York-based independent forecasting group, said its Weekly Leading Index dropped to 120.9 in the week ended Nov 25 from a revised 122.2 the previous week, originally reported at 122.3.

The index's annualized growth rate worsened to minus 7.8 percent from minus 7.4 percent a week earlier, which was revised from minus 7.3.