A measure of future U.S. economic growth eased last week, though 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  edged down to 125.7 in the week ended April 6 from 126.3 the previous week.

That was originally reported as 126.5. The index's annualized growth rate rose to 1.4 percent from  0.9 percent a week earlier.