seasonal is an easy-to-use and full-featured R interface to X-13ARIMA-SEATS, the seasonal adjustment software developed by the United States Census Bureau. The latest CRAN version of seasonal fixes several bugs and makes it easier to access output from multiple objects. See here for a complete list of changes.
seas() is the core function of the seasonal package. By default,
the automatic procedures of X-13ARIMA-SEATS to perform a seasonal adjustment
that works well in most circumstances:
For a more detailed introduction, read our article in the Journal of Statistical Software.
Multiple series adjustment
The previous version has introduced the adjustment of multiple series in a single call to
seas(). This has removed the need for loops or
lapply() in such cases and finally brought the composite spec to seasonal.
Multiple adjustments can be performed by supplying multiple time series as an
library(seasonal) m0 <- seas(cbind(fdeaths, mdeaths), x11 = "") final(m0)
This performs two seasonal adjustments, one for
fdeaths and one for
mdeaths. The vignette on multiple adjustments describes how to specify options for individual series.
Accessing composite output
composite argument is a list with an X-13 specification applied to the aggregated series:
m1 <- seas( cbind(mdeaths, fdeaths), composite = list(), series.comptype = "add" )
With version 1.9 can now use
out() to access the output of the composite spec:
We can also use
series(), e.g., to access the final, indirectly adjusted series via the
composite spec (see
?series for all available series):
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