The X13 procedure provides seasonal adjustment of time series by using the US Bureau of the Census X-13ARIMA-SEATS seasonal adjustment program. The X-13ARIMA-SEATS program was developed by the Time Series Staff of the Statistical Research Division, US Census Bureau, by incorporating the SEATS method into the X-12-ARIMA seasonal adjustment program.
The X13 procedure generalizes the older X11 and X12 procedures and includes the following features:
US Bureau of the Census X-13ARIMA-SEATS seasonal adjustment program
support for the X-12 ARIMA method
support for the X-11 ARIMA method
all the features of the Census Bureau program
processing of any number of variables at once with no maximum length for a series
decomposition of monthly or quarterly series into seasonal, trend, trading day, and irregular components
multiplicative, additive, pseudo-additive, and log additive forms of the decomposition
support for regARIMA modeling
automatic identification of outliers
support for TRAMO-based automatic model selection
support for sliding spans analysis
use of regressors to process missing values within the span of the series
computation of tests for stable, moving, and combined seasonality
spectral analysis of original, seasonally adjusted, and irregular series
ability to project seasonal component one year ahead, which enables reintroduction of seasonal factors for an extrapolated series
full control over what is printed or output