A measure of future U.S. economic growth was little changed in the latest week, but the annualized growth rate continued to improve, a research group said on Friday.

The Economic Cycle Research Institute, a New York-based independent forecasting group, said its Weekly Leading Index inched down to 122.1 in the week ended Nov 11 from 122.3 the previous week.

The index's annualized growth rate gained to minus 7.8 percent from minus 8.5 percent a week earlier.