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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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NOBSERVATIONS Subcommand<br />

DIMENSION Subcommand<br />

INITIAL Subcommand<br />

MAXITER Subcommand<br />

OVERALS 1179<br />

NOBSERVATIONS specifies how many cases are used in the analysis.<br />

• If NOBSERVATIONS is not specified, all available observations in the working data file are<br />

used.<br />

• NOBSERVATIONS is followed by an integer, indicating that the first n cases are to be used.<br />

DIMENSION specifies the number of dimensions you want OVERALS to compute.<br />

• If you do not specify the DIMENSION subcommand, OVERALS computes two dimensions.<br />

• DIMENSION is followed by an integer indicating the number of dimensions.<br />

• If all the variables are SNOM (single nominal), ORDI (ordinal), or NUME (numerical), the<br />

maximum number of dimensions you can specify is the total number of variables on the<br />

ANALYSIS subcommand.<br />

• If some or all of the variables are MNOM (multiple nominal), the maximum number of dimensions<br />

you can specify is the number of MNOM variable levels (categories) plus the<br />

number of nonMNOM variables, minus the number of MNOM variables.<br />

• The maximum number of dimensions must be less than the number of observations minus 1.<br />

• If the number of sets is two and all variables are SNOM, ORDI, or NUME, the number of<br />

dimensions should not be more than the number of variables in the smaller set.<br />

• If the specified value is too large, OVERALS tries to adjust the number of dimensions to<br />

the allowable maximum. It might not be able to adjust if there are MNOM variables with<br />

missing data.<br />

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

• The specification on INITIAL is keyword NUMERICAL or RANDOM. If the INITIAL subcommand<br />

is not specified, NUMERICAL is the default.<br />

NUMERICAL Treat all variables except multiple nominal as numerical. This is usually best<br />

to use when there are no SNOM variables.<br />

RANDOM Compute a random initial configuration. This should be used only when<br />

some or all of the variables are SNOM.<br />

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

computations.<br />

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

• The specification on MAXITER is an integer indicating the maximum number of iterations.

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