BASELINE <OUT=SAS-data-set> <OUTDIFF=SAS-data-set> <COVARIATES=SAS-data-set> <TIMELIST=list> <keyword=name …keyword=name> </ options>;
The BASELINE statement creates a SAS data set (named by the OUT= option) that contains the baseline function estimates at the event times of each stratum for every set of covariates in the COVARIATES= data set. If the COVARIATES= data set is not specified, a reference set of covariates consisting of the reference levels for the CLASS variables and the average values for the continuous variables is used. You can use the DIRADJ option to obtain the direct adjusted survival curve that averages the estimated survival curves for the observations in the COVARIATES= data set. No BASELINE data set is created if the model contains a time-dependent variable defined by means of programming statement.
Table 73.2 summarizes the options available in the BASELINE statement.
Table 73.2: BASELINE Statement Options
Option |
Description |
---|---|
Data Set and Time List Options |
|
Specifies the output BASELINE data set |
|
Specifies the output data set that contains differences of direct adjusted survival curves |
|
Specifies the SAS data set that contains the explanatory variables |
|
Specifies a list of time points for Bayesian computation of survival estimates. |
|
Keyword Options |
|
Specifies the cumulative incidence estimate |
|
Specifies the cumulative mean function estimate |
|
Specifies the cumulative hazard function estimate |
|
Specifies the log of the negative log of SURVIVAL |
|
Specifies the log of SURVIVAL |
|
Specifies the lower pointwise confidence limit for CIF |
|
Specifies the lower pointwise confidence limit for CMF |
|
specifies the lower pointwise confidence limit for CUMHAZ |
|
Specifies the lower limit of the HPD interval for CUMHAZ |
|
Specifies the lower limit of the HPD interval for SURVIVAL |
|
Specifies the lower pointwise confidence limit for SURVIVAL |
|
Specifies the estimated standard error of CIF |
|
Specifies the estimated standard error of CMF |
|
Specifies the estimated standard error of CUMHAZ |
|
Specifies the standard error of SURVIVAL |
|
Specifies the estimated standard error of the linear predictor estimator |
|
Specifies the survivor function estimate |
|
Specifies the upper pointwise confidence limit for CIF |
|
Specifies the upper pointwise confidence limit for CMF |
|
Specifies the upper pointwise confidence limit for CUMHAZ |
|
Specifies the upper limit of the HPD interval for CUMHAZ |
|
Specifies the upper limit of the HPD interval for SURVIVAL |
|
Specifies the upper pointwise confidence limit for SURVIVAL |
|
Specifies the estimate of the linear predictor |
|
Other Options |
|
Specifies the significance level of the confidence interval for the survivor function |
|
Specifies the transformation used to compute the confidence limits |
|
Computes direct adjusted survival curves |
|
Names a variable whose values are used to identify or group the survival curves |
|
Specifies the method used to compute the survivor function estimates |
|
Specifies the number of normal random samples for CIF confidence limits |
|
Names the variable in the COVARIATES= data set for identifying the baseline functions curves in the plots |
|
Specifies the random number generator seed |
The following options are available in the BASELINE statement.
The following options can appear in the BASELINE statement after a slash (/). The METHOD= and CLTYPE= options apply only to the estimate of the survivor function in the classical analysis. For the Bayesian analysis, the survivor function is estimated by the Breslow (1972) method.
For recurrent events data, both CMF= and CUMHAZ= statistics are the Nelson estimators, but their standard error are not the same. Confidence limits for the cumulative mean function and cumulative hazard function are based on the log transform.