ECRI's Weekly Leading Index (WLI) is a composite index key USA weekly economic series. The limited availability of weekly data constrains the number of variables in the composite index, but this has not hurt the WLI's predictive power. The weekly frequency of the WLI makes it a very timely gauge of the economy's direction. During the past 10 years, there was a correlation of 69% when the index grew 6 months paced with 2 quarters growth in U.S. GDP (i.e. 69% chance the index precedes the economic trend).