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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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1736 Appendix A<br />

are specified on an ARIMA command, the variables automatically generated are FIT#1,<br />

ERR#1, LCL#1, UCL#1, SEP#1, FIT#2, ERR#2, LCL#2, UCL#2, and SEP#2. If these<br />

variables already exist from a previous procedure, their values are replaced.<br />

• If TSET NEWVAR=ALL is in effect, all variables generated during the session are saved<br />

in the working data file. Variables are named using the extension _n, where n increments<br />

by 1 for each new variable of a given type. For example, if two series are specified<br />

on an EXSMOOTH command, the FIT variables generated would be FIT_1 and<br />

FIT_2. If an AREG command with one series followed, the FIT variable would be<br />

FIT_3.<br />

• A third TSET NEWVAR option, NONE, allows you to display statistical results from a<br />

procedure without creating any new variables. This option can result in faster<br />

processing time.<br />

TO Keyword<br />

The order in which new variables are added to the working data file dictionary is ERR,<br />

SAS, SAF, and STC for SEASON, and FIT, ERR, LCL, UCL, and SEP for the other<br />

procedures. For this reason, the TO keyword should be used with caution for specifying<br />

lists of these generated variables. For example, the specification ERR#1 TO ERR#3 indicates<br />

more than just ERR#1, ERR#2, and ERR#3. If the residuals are from an ARIMA<br />

procedure, ERR#1 TO ERR#3 indicates ERR#1, LCL#1, UCL#1, SEP#1, FIT#2,<br />

ERR#2, LCL#2, UCL#2, SEP#2, FIT#3, and ERR#3.<br />

Maximum Number of New Variables<br />

TSET MXNEWVAR specifies the maximum number of new variables that can be generated<br />

by a procedure. The default is 60.<br />

Periodicity<br />

Trends provides several ways to specify the periodicity of your series.<br />

• Many Trends commands have a subcommand such as PERIOD that can set the periodicity<br />

for that specific procedure.<br />

• TSET PERIOD can be used to set the periodicity to be used globally. This specification<br />

can be changed by another TSET PERIOD command.<br />

• The DATE command assigns date variables to the observations. Most of these variables<br />

have periodicities associated with them.<br />

If more than one of these periodicities are in effect when a procedure that uses periodicity<br />

is executed, the following precedence determines which periodicity is used:<br />

• First, the procedure uses any periodicity specified within the procedure.

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