The default value is 1E-12. The mean survival time can be shown to be the area under the Kaplan-Meier survival curve. However, if the largest observed time in the data is censored, the area under the survival curve is not a closed area. This option is ignored if the largest observed time is an event time. Valid time-limit values are as follows.
L is the largest event time in the data.
L is the largest observed time in the data. L is the given number . The number must be positive and at least as large as the largest event time in the data. Since the Kaplan-Meier survival curve is a decreasing step function, each given time point falls in an interval that has a constant survival estimate. The event time that corresponds to the beginning of the time interval is displayed along with its survival estimate.