PROC LIFEREG Statement

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The LIFEREG Procedure

PROC LIFEREG Statement

PROC LIFEREG < options > ;

The PROC LIFEREG statement invokes the procedure. You can specify the following options in the PROC LIFEREG statement.

COVOUT

writes the estimated covariance matrix to the OUTEST=data set if convergence is attained.

DATA=SAS-data-set

specifies the input SAS data set used by PROC LIFEREG. By default, the most recently created SAS data set is used.

NOPRINT

suppresses the display of the output. Note that this option temporarily disables the Output Delivery System (ODS). For more information, see Chapter 15, "Using the Output Delivery System."

ORDER=DATA | FORMATTED | FREQ | INTERNAL

specifies the sorting order for the levels of the classification variables (specified in the CLASS statement). This ordering determines which parameters in the model correspond to each level in the data. The following table illustrates how PROC LIFEREG interprets values of the ORDER= option.

Value of ORDER=		Levels Sorted By
DATA		order of appearance in the input data set
FORMATTED		formatted value
FREQ		descending frequency count; levels with the
		most observations come first in the order
INTERNAL		unformatted value

By default, ORDER=FORMATTED. For FORMATTED and INTERNAL, the sort order is machine dependent. For more information on sorting order, refer to the chapter titled "The SORT Procedure" in the SAS Procedures Guide.

OUTEST=SAS-data-set

specifies an output SAS data set containing the parameter estimates, the maximized log likelihood and, if the COVOUT option is specified, the estimated covariance matrix. See the section "OUTEST= Data Set" for a detailed description of the contents of the OUTEST= data set. This data set is not created if class variables are used.

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