A measure of future U.S. economic growth slipped to a four-week low while the annualized growth held steady, a research group said on Friday.

The Economic Cycle Research Institute, a New York-based independent forecasting group, said its Weekly Leading Index stood at 132.1 in the week ended September 27, down from 132.9 the prior week.

The index's annualized growth was 4.8 percent, matching the previous week's revised figure. The prior week's rate was originally reported as 4.9 percent.