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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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Example<br />

DISCRIMINANT 473<br />

DISCRIMINANT GROUPS=SUCCESS(0,1)<br />

/VARIABLES=A, B, C, D, E<br />

/ANALYSIS=A TO C (2) D, E (1)<br />

/METHOD=WILKS.<br />

• A, B, and C are entered into the analysis first, assuming that they pass the tolerance criterion.<br />

Since their inclusion level is even, they are entered together.<br />

• D and E are then entered stepwise. The one that minimizes the overall value of Wilks’<br />

lambda is entered first.<br />

• After entering D and E, the program checks whether the partial F for either one justifies<br />

removal from the equation (see the FOUT and POUT subcommands on p. 474).<br />

Example<br />

DISCRIMINANT GROUPS=SUCCESS(0,1)<br />

/VARIABLES=A, B, C, D, E<br />

/ANALYSIS=A TO C (2) D, E (1).<br />

• Since no stepwise method is specified, inclusion levels have no effect and all variables<br />

are entered into the model at once.<br />

METHOD Subcommand<br />

METHOD is used to select a method for entering variables into an analysis.<br />

• A variable will never be entered into the analysis if it does not pass the tolerance criterion<br />

specified on the TOLERANCE subcommand (or the default).<br />

• A METHOD subcommand applies only to the preceding ANALYSIS subcommand, or to an<br />

analysis using all predictor variables if no ANALYSIS subcommand has been specified<br />

before it.<br />

• If more than one METHOD subcommand is specified within one analysis block, the last is<br />

used.<br />

Any one of the following methods can be specified on the METHOD subcommand:<br />

DIRECT All variables passing the tolerance criteria are entered simultaneously. This<br />

is the default method.<br />

WILKS At each step, the variable that minimizes the overall Wilks’ lambda is<br />

entered.<br />

MAHAL At each step, the variable that maximizes the Mahalanobis distance between<br />

the two closest groups is entered.<br />

MAXMINF At each step, the variable that maximizes the smallest F ratio between pairs<br />

of groups is entered.<br />

MINRESID At each step, the variable that minimizes the sum of the unexplained variation<br />

for all pairs of groups is entered.<br />

RAO At each step, the variable that produces the largest increase in Rao’s V is<br />

entered.

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