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Consumer Price Index
Bureau of Labor Statistics > Consumer Price Index > Methods > Seasonal Adjustment
Updated seasonal factors introduced February 10, 2023

The Consumer Price Index (CPI) produces both unadjusted and seasonally adjusted data. Seasonally adjusted data are computed using seasonal factors derived by the X-13ARIMA-SEATS Seasonal Adjustment Method. These factors are updated with the release of January data in February and reflect price movements from the previous calendar year. The new factors are used to revise the previous 5 years of seasonally adjusted data; older seasonally adjusted indexes are considered to be final. Recalculated seasonally adjusted indexes as well as recalculated seasonal adjustment factors for the period January 2018 through December 2022 were made available on Friday, February 10, 2023.

Data

  • Revised seasonally adjusted indexes and factors, 2018-2022 (XLSX)
  • Seasonal factors table, 2023 (XLSX)
  • Series changing seasonal status, 2018-2022 (HTML)
  • Components of seasonally adjusted all items, 2023 (HTML)
  • Intervention analysis in seasonal adjustment, 2023 (HTML)
  • Specification files, 2018-2022 (ZIP)
  • New vehicles data (XLSX)
  • Archived seasonal adjustment data

 

Last Modified Date: November 20, 2023