Revision of Industrial Production and Capacity Utilization

The Federal Reserve Board plans to issue an annual revision to the index of industrial production (IP) and the related measures of capacity and capacity utilization on March 28, 2008. The revised IP indexes will incorporate data from the 2006 Annual Surveys of Manufactures and data from selected editions of the 2006 Current Industrial Reports, all from the U.S. Census Bureau. Annual data from the U.S. Geological Survey regarding metallic and nonmetallic minerals (except fuels) for 2006 will also be incorporated. The updating will include revisions to the monthly indicator (either product data or input data) and to seasonal factors for each industry as well as changes in the estimation methods for some series. Any changes to methods for estimating the output of an industry will affect the index from 1972 to the present.

After the publication of the revision, later monthly releases will include new or revised indexes for a six-month reporting window: one month of new data and revisions to the previous five months of data. The new longer reporting window will allow the incorporation of additional lagging data before an annual revision. Over the past year, with a six-month window, an additional 3 percent to 4 percent of IP would have reflected source data. The longer reporting window will cause the latest month of data shown for a few indexes to be as many as five months earlier than the latest value for aggregate industrial production; data for detailed production indexes are not shown in the supplement to the G.17 until either the underlying data are available or the reporting window is closed. Currently, the data issued for only one or two of the published indexes would be affected by this change.

Capacity and capacity utilization will be revised to reflect the revised production indexes and to incorporate data from the Census Bureau's 2006 Survey of Plant Capacity, which covers manufacturing, along with new data on capacity from the U.S. Geological Survey, the Department of Energy, and other organizations.

Once the revision is published, it will be available on the Board's website at www.federalreserve.gov/releases/G17. The revised data will also be available through the website of the Department of Commerce. Further information on these revisions can be obtained from the Board's Industrial Output Section (telephone number 202-452-3197).