Previous Page | Next Page

The LIFEREG Procedure

PROC LIFEREG <options> ;

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


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


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


specifies a graphics catalog in which to save graphics output.


specifies an input SAS data set that contains initial estimates for all the parameters in the model. See the section INEST= Data Set for a detailed description of the contents of the INEST= data set.


specifies the length of effect names in tables and output data sets to be characters, where is a value between 20 and 200. The default length is 20 characters.


suppresses the display of the output. Note that this option temporarily disables the Output Delivery System (ODS). For more information, see Chapter 20, Using the Output Delivery System.


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



order of appearance in the input data set



formatted value



descending frequency count; levels with the


most observations come first in the order



unformatted value

By default, ORDER=FORMATTED. For FORMATTED and INTERNAL, the sort order is machine dependent. For more information about sorting order, see the chapter on the SORT procedure in the Base SAS Procedures Guide, and the discussion of BY-group processing in SAS Language Reference: Concepts.


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.


specifies the following graphics options:


suppresses any graphics specified in other LIFEREG statements, such as the BAYES or PROBPLOT statement.


creates a default probability plot based on information in the MODEL statement. If a PROBPLOT option is also specified, the probability plot specified in the PROBPLOT statement is created, and this option is ignored.


specifies an input SAS data set that contains values for all the independent variables in the MODEL statement and variables in the CLASS statement for probability plotting. If there are covariates specified in a MODEL statement and a probability plot is requested with a PROBPLOT statement, you specify fixed values for the effects in the MODEL statement with the XDATA= data set. See the section XDATA= Data Set for a detailed description of the contents of the XDATA= data set.

Previous Page | Next Page | Top of Page