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SPSS® 12.0 Command Syntax Reference

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Appendix A<br />

Trends Options: Special<br />

Considerations<br />

Most of the rules described in the Universals section apply to Trends. This section<br />

explains some areas that are unique to working with Trends. The topics are divided into<br />

five sections:<br />

• Operations discusses general operating rules, missing values in Trends, and how to<br />

control the quantity of output using TSET.<br />

• New Variables describes the types of series generated by Trends procedures and their<br />

naming conventions.<br />

• Periodicity describes the facilities for specifying the periodicity of your series.<br />

• APPLY Subcommand discusses the models generated by Trends procedures and how<br />

to use the APPLY subcommand as a shorthand method for developing and modifying<br />

models.<br />

Operations<br />

There are a few general operating rules you should be aware of when working with<br />

Trends:<br />

• A pass of the data is caused by every Trends command except the following: MODEL<br />

NAME, READ MODEL, SAVE MODEL, and TDISPLAY.<br />

• Except when you apply a previous model with the APPLY subcommand, subcommands<br />

are in effect only for the current procedure.<br />

• Whenever a subcommand of a procedure performs the same function as a TSET<br />

setting, the procedure subcommand, if specified, overrides TSET.<br />

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