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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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214 <strong>Syntax</strong> <strong>Reference</strong><br />

SUPPLEMENTARY Subcommand<br />

INITIAL Subcommand<br />

MAXITER Subcommand<br />

CRITITER Subcommand<br />

The SUPPLEMENTARY subcommand specifies the objects that you want to treat as supplementary.<br />

You cannot weight supplementary objects (specified weights are ignored).<br />

OBJECT Supplementary objects. Objects that you want to treat as supplementary<br />

are indicated with an object number list in parentheses following<br />

OBJECT. The keyword TO is allowed, for example, OBJECT(1 TO 1 3<br />

5 TO 9).<br />

INITIAL specifies the method used to compute the initial value/configuration.<br />

• The specification on INITIAL is keyword NUMERICAL or RANDOM. If INITIAL is not<br />

specified, NUMERICAL is the default.<br />

NUMERICAL Treat all variables as numerical. This is usually best to use when there<br />

are only numerical and/or ordinal variables.<br />

RANDOM Provide a random initial value. This should be used only when there<br />

is at least one nominal variable.<br />

MAXITER specifies the maximum number of iterations CATREG can go through in its computations.<br />

Note that the output starts from the iteration number 0, which is the initial value<br />

before any iteration, when INITIAL = NUMERICAL is in effect.<br />

• If MAXITER is not specified, CATREG will iterate up to 100 times.<br />

• The specification on MAXITER is a positive integer indicating the maximum number of<br />

iterations. There is no uniquely predetermined (hard coded) maximum for the value that<br />

can be used.<br />

CRITITER specifies a convergence criterion value. CATREG stops iterating if the difference<br />

in fit between the last two iterations is less than the CRITITER value.<br />

• If CRITITER is not specified, the convergence value is 0.00001.<br />

• The specification on CRITITER is any value less than or equal to 0.1 and greater than or<br />

equal to .000001. (Values less than the lower bound might seriously affect performance.<br />

Therefore, they are not supported.)

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