SPSS® 12.0 Command Syntax Reference

544 Syntax Reference
APPLY Subcommand
APPLY allows you to use a previously defined EXSMOOTH model without having to repeat
the specifications. For general rules on APPLY, see the APPLY subcommand on p. 1737.
• The only specification on APPLY is the name of a previous model in quotes. If a model
name is not specified, the model specified on the previous EXSMOOTH command is used.
• To change one or more model specifications, specify the subcommands of only those portions
you want to change after the APPLY subcommand.
• If no series are specified on the command, the series that were originally specified with
the model being reapplied are used.
• To change the series used with the model, enter new series names before or after the
APPLY subcommand. If a series name is specified before APPLY, the slash before the subcommand
is required.
• Initial values from the previous model’s INITIAL subcommand are applied unless you
specify INITIAL = CALCULATE or a new set of initial values. Initial values from the original
model are not applied if they were calculated by EXSMOOTH.
• Seasonal factor estimates from the original model’s SEASFACT subcommand are not applied.
To use seasonal factor estimates, you must respecify SEASFACT.
Example
EXSMOOTH VAR1
/MODEL=NA
/PERIOD=12
/ALPHA=0.2
/DELTA=0.2.
EXSMOOTH APPLY
/DELTA=0.3.
EXSMOOTH VAR2
/APPLY.
• The first command uses a model with no trend but additive seasonality for series VAR1.
The length of the season (PERIOD) is 12. A general smoothing parameter (ALPHA) and a
seasonal smoothing parameter (DELTA) are used, both with values set equal to 0.2.
• The second command applies the same model to the same series but changes the delta
value to 0.3. Everything else stays the same.
• The last command applies the model and parameter values used in the second EXSMOOTH
command to series VAR2.
Example
EXSMOOTH VAR3
/MOD=NA
/ALPHA=0.20
/DELTA=0.4
/INITIAL=(114,20).
EXSMOOTH VAR4
/APPLY
/INITIAL=CALCULATE.