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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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304 COXREG<br />

PLOT Subcommand<br />

You can request specific plots to be produced with the PLOT subcommand. Each requested<br />

plot is produced once for each pattern specified on the PATTERN subcommand. If PLOT is<br />

not specified, the default is NONE (no plots are printed). Requested plots are displayed at the<br />

end of the final model.<br />

• The set of plots requested is displayed for the functions at the mean of the covariates and<br />

at each combination of covariate values specified on PATTERN.<br />

• If time-dependent covariates are included in the model, no plots are produced.<br />

• Lines on a plot are connected as step functions.<br />

NONE Do not display plots.<br />

SURVIVAL Plot the cumulative survival distribution.<br />

HAZARD Plot the cumulative hazard function.<br />

LML Plot the log-minus-log-of-survival function.<br />

OMS Plot the one-minus-survival function.<br />

PATTERN Subcommand<br />

PATTERN specifies the pattern of covariate values to be used for the requested plots and<br />

coefficient tables.<br />

• A value must be specified for each variable specified on PATTERN.<br />

• Continuous variables that are included in the model but not named on PATTERN are<br />

evaluated at their means.<br />

• Categorical variables that are included in the model but not named on PATTERN are<br />

evaluated at the means of the set of contrasts generated to replace them.<br />

• You can request separate lines for each category of a variable that is in the model. Specify<br />

the name of the categorical variable after the keyword BY. The BY variable must be a categorical<br />

covariate. You cannot specify a value for the BY covariate.<br />

• Multiple PATTERN subcommands can be specified. COXREG produces a set of requested<br />

plots for each specified pattern.<br />

• PATTERN cannot be used when time-dependent covariates are included in the model.<br />

OUTFILE Subcommand<br />

OUTFILE writes an external SPSS data file. COXREG writes two types of data files. You can<br />

specify the file type to be created with one of the two keywords, followed by the file<br />

specification in parentheses.<br />

COEFF Write an SPSS data file containing the coefficients from the final model.

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