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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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• The default keywords for CLASSIFY are NONMISSING and POOLED.<br />

DISCRIMINANT 481<br />

NONMISSING Classify all cases that do not have missing values on any predictor variables.<br />

Two sets of classification results are produced, one for selected cases (those<br />

specified on the SELECT subcommand) and one for unselected cases. This is<br />

the default.<br />

UNSELECTED Classify only unselected cases. The classification phase is suppressed for<br />

cases selected via the SELECT subcommand. If all cases are selected (when<br />

the SELECT subcommand is omitted), the classification phase is suppressed<br />

for all cases and no classification results are produced.<br />

UNCLASSIFIED Classify only unclassified cases. The classification phase is suppressed for<br />

cases that fall within the range specified on the GROUPS subcommand.<br />

POOLED Use the pooled within-groups covariance matrix to classify cases. This is the<br />

default.<br />

SEPARATE Use separate-groups covariance matrices of the discriminant functions for<br />

classification. DISCRIMINANT displays the group covariances of canonical<br />

discriminant functions and Box’s test of equality of covariance matrices of<br />

canonical discriminant functions. Since classification is based on the<br />

discriminant functions and not the original variables, this option is not<br />

necessarily equivalent to quadratic discrimination.<br />

MEANSUB Substitute means for missing predictor values during classification. During<br />

classification, means are substituted for missing values and cases with<br />

missing values are classified. Cases with missing values are not used during<br />

analysis.<br />

PLOT Subcommand<br />

PLOT requests additional output to help you examine the effectiveness of the discriminant<br />

analysis.<br />

• If PLOT is specified without keywords, the default is COMBINED and CASES.<br />

• If any keywords are requested on PLOT, only the requested plots are displayed.<br />

• If PLOT is specified with any keyword except MAP, DISCRIMINANT displays a classification<br />

processing summary table and a prior probabilities for groups table.<br />

COMBINED All-groups plot. For each case, the first two function values are plotted.<br />

CASES(n) Casewise statistics. For each case, classification information, squared<br />

Mahalanobis distance to centroid for the highest and second highest groups,<br />

and discriminant scores of all functions are plotted. Validated statistics are<br />

displayed for selected cases if CROSSVALID is specified on STATISTICS. If n<br />

is specified, DISCRIMINANT displays the first n cases only.<br />

MAP Territorial map. A plot of group centroids and boundaries used for classifying<br />

groups.

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