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July 2010

PPI and CPI seasonal adjustment: an update

Jonathan C. Weinhagen, Jeffrey S. Wilson, Steven M. Muri

A new update of BLS seasonal adjustment procedures ensures that differences between seasonally adjusted PPI and CPI series are due to the underlying unadjusted data, and not to differences in seasonal adjustment methods; in a further improvement, PPI and CPI analysts are now coordinating their efforts.

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