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Survival Analysis Using SAS®: A Practical Guide by Paul D. Allison

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Life Tables from Grouped Data

Although PROC LIFETEST estimates survival probabilities from individual-level data with exact event times, you can also easily construct life tables from published data that provide only

  • the boundaries of the intervals

  • the number of events in each interval

  • the number of censored cases in each interval.

Consider the following survival data for 68 patients from the Stanford Heart Transplantation Program, as reported by Elandt-Johnson and Johnson (1980):

Number of DaysNumber of DeathsNumber Censored
0-50163
50-100110
100-20042
200-40054
400-70026
700-100043
1000-130012
1300-160013
1600+01

Time is measured from the date of the transplant. Although this sample is rather small for constructing a life table, it will do fine for illustration. ...

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