The X11 Procedure
The X11 procedure provides seasonal adjustment of time series using the Census X-11 or X-11 ARIMA method. The X11 procedure is based on the U.S. Bureau of the Census X-11 seasonal adjustment program, and it also supports the X-11 ARIMA method developed by Statistics Canada. In addition the X11 procedure
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decomposes monthly or quarterly series into seasonal, trend, trading day, and irregular components
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provides multiplicative and additive form of the decomposition
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processes any number of variables at once with no maximum length for a series
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stores the individual X11 tables showing the various components at different stages of the computation
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provides control over what is printed or output
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projects seasonal component one year ahead, enabling reintroduction of seasonal factors for an extrapolated series
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