The SURVEYPHREG Procedure
- Overview
- Getting Started
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Syntax
PROC SURVEYPHREG StatementBY StatementCLASS StatementCLUSTER StatementDOMAIN StatementESTIMATE StatementFREQ StatementLSMEANS StatementLSMESTIMATE StatementMODEL StatementNLOPTIONS StatementOUTPUT StatementProgramming StatementsREPWEIGHTS StatementSLICE StatementSTORE StatementSTRATA StatementTEST StatementWEIGHT Statement -
DetailsNotation and EstimationFailure Time DistributionTime and CLASS Variables UsagePartial Likelihood Function for the Cox ModelSpecifying the Sample DesignMissing ValuesVariance EstimationDomain AnalysisHypothesis Tests, Confidence Intervals, and ResidualsOutput Data SetsDisplayed OutputODS Table NamesODS Graphics
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Examples
- References
BY variables ;
You can specify a BY statement in PROC SURVEYPHREG to obtain separate analyses of observations in groups that are defined by the BY variables. When a BY statement appears, PROC SURVEYPHREG expects the input data set to be sorted in order of the BY variables. If you specify more than one BY statement, only the last one specified is used.
If your input data set is not sorted in ascending order, use one of the following alternatives:
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Sort the data by using the SORT procedure and a similar BY statement.
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Specify the NOTSORTED or DESCENDING option in the BY statement for the SURVEYPHREG procedure. The NOTSORTED option does not mean that the data are unsorted but rather that the data are arranged in groups (according to values of the BY variables) and that these groups are not necessarily in alphabetical or increasing numeric order.
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Create an index on the BY variables by using the DATASETS procedure (in Base SAS software).
Note that using a BY statement provides completely separate analyses of the BY groups. It does not provide a domain (subpopulation) analysis, where the total number of units in the subpopulation is not known at the time the survey is designed. For such an analysis use the DOMAIN statement.
For more information about BY-group processing, see SAS Language Reference: Concepts. For more information about the DATASETS procedure, see Base SAS Procedures Guide.