This page contains links to the two most widely-use seasonal adjustment programs in the world. Both are available free of charge.

• X-12-ARIMA
• SEATS

Seasonal Adjustment Software

Seasonal adjustment is usually done with an off-the-shelf program. The two most widely-used seasonal adjustment softwares are available for free.

X-12-ARIMA is used at the U.S. Census Bureau for all official seasonal adjustments in the publications. For more information on X-12-ARIMA, please see the questions in the FAQ related to X-12-ARIMA. (Click here to leave this site and go to the U.S. Census Bureau's site for X-12-ARIMA.)

• X-12-ARIMA from the US Census Bureau. Features:
  • Extensive time series modeling and model selection capabilities for linear regression models with ARIMA errors (regARIMA models)
  • Wide variety of seasonal and trend filter options
  • Diagnostics of the quality and stability of the adjustments achieved under the options selected
  • The ability to process many series at once

TRAMO/SEATS is used by some statistical offices and banks, primarily in Europe. For more information on TRAMO/SEATS, please see the questions in the FAQ related to SEATS. (Click here to leave this site and go to the Bank of Spain's pages for TRAMO/SEATS.)

• TRAMO/SEATS from the Bank of Spain. Features:
  • Extensive time series modeling and model selection capabilities for linear regression models with ARIMA errors (regARIMA models)
  • Fully automatic options, including options for running many series at once

Last update: 10 January 2007