Seasonal adjustment.
The seas command carries out seasonal adjustment using either the ratio to moving average, or the difference from moving average technique.
EViews also performs Census X11 and X12 seasonal adjustment. For details, see
Series::x11 and
Series::x12.
Syntax
seas(options) series_name name_adjust [name_fac]
List the name of the original series and the name to be given to the seasonally adjusted series. You may optionally include an additional name for the seasonal factors. seas will display the seasonal factors using the convention of the Census X11 program.
Options
m | Multiplicative (ratio to moving average) method. |
a | Additive (difference from moving average) method. |
prompt | Force the dialog to appear from within a program. |
Examples
seas(a) pass pass_adj pass_fac
seasonally adjusts the series PASS using the additive method, and saves the adjusted series as PASS_ADJ and the seasonal factors as PASS_FAC.
Cross-references
See
“Seasonal Adjustment” for a discussion of seasonal adjustment methods.