SELECT Subcommand (LOGISTIC REGRESSION command)

By default, all cases in the active dataset are considered for inclusion in LOGISTIC REGRESSION. Use the optional SELECT subcommand to include a subset of cases in the analysis.

• The specification is either a logical expression or keyword ALL. ALL is the default. Variables that are named on VARIABLES, CATEGORICAL, or METHOD subcommands cannot appear on SELECT.
• In the logical expression on SELECT, the relation can be EQ, NE, LT, LE, GT, or GE. The variable must be numeric, and the value can be any number.
• Only cases for which the logical expression on SELECT is true are included in calculations. All other cases, including those cases with missing values for the variable that is named on SELECT, are unselected.
• Diagnostic statistics and classification statistics are reported for both selected and unselected cases.
• Cases that are deleted from the active dataset with the SELECT IF or SAMPLE command are not included among either the selected or unselected cases.

Example

LOGISTIC REGRESSION VARIABLES=GRADE WITH GPA,TUCE,PSI
 /SELECT SEX EQ 1 /CASEWISE=RESID.

• Only cases with the value 1 for SEX are included in the logistic regression analysis.
• Residual values that are generated by CASEWISE are displayed for both selected and unselected cases.