The LIFETEST Procedure

OUTCIF= Data Set

You can specify the OUTCIF= option in the PROC LIFETEST statement to create an output data set that contains the cumulative incidence estimates. The data set contains the following columns:

  • any specified BY variables

  • the censoring variable as given in the TIME statement to indicate the failure of interest

  • a numeric variable named STRATUM that numbers the strata, if you specify the STRATA statement

  • any specified STRATA variables, whose values come from either their original values or the midpoints of the stratum intervals if you use cutpoints to define strata (semi-infinite intervals are labeled by their finite endpoint)

  • the GROUP= variable, if you specify the GROUP= option in the STRATA statement

  • the Timelist variable, if you specify the TIMELIST= option and the REDUCEOUT option in the PROC LIFETEST statement

  • the time variable as specified in the TIME statement

  • AtRisk, a variable that contains the number of subjects at risk just before the specified time. This variable is omitted if you specify the REDUCEOUT option in the PROC LIFETEST statement.

  • Event, a variable that contains the number of subjects that fail at the specified time from the cause of interest. This variable is omitted if you specify the REDUCEOUT option in the PROC LIFETEST statement.

  • AllEventTypes, a variable that contains the number of subjects that fail at the specified time from any cause. This variable is omitted if you specify the REDUCEOUT option in the PROC LIFETEST statement.

  • CIF, a variable that contains the point estimates of the cumulative incidence function

  • CIF_STDERR, a variable that contains the standard errors of the CIF estimator

  • ALPHA, a variable that contains the $\alpha $-level of the confidence intervals

  • CONFTYPE, a variable that contains the name of the transformation that is applied to the CIF to compute the confidence intervals for the CIF

  • CIF_LCL, a variable that contains the lower confidence limits of the CIF

  • CIF_UCL, a variable that contains the upper confidence limits of the CIF

Each estimated CIF contains an initial observation whose value is 1 for the CIF and 0 for the time. The output data set contains an observation for each distinct failure time when an event occurs or an observation is censored.