Frequently Asked Questions

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What is X-12-ARIMA?

X-12-ARIMA is a seasonal adjustment program developed at the U.S. Census Bureau. The program is based on the Bureau's earlier X-11 program and the X-11-ARIMA/88 program developed at Statistics Canada.

Improvements to X-12-ARIMA include:

  • Use of ARIMA models to forecast the series, allowing us to use better, symmetric moving averages that give us generally smaller revisions to the seasonal factors;
  • New diagnostic tools; Wider variety of moving average options; and
  • New user interface.
  • For more information, see the X-12-ARIMA website.

For more information, visit the Monthly and Annual Retail Trade website.


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