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 Days | Number of Deaths | Number Censored |
|---|---|---|
| 0-50 | 16 | 3 |
| 50-100 | 11 | 0 |
| 100-200 | 4 | 2 |
| 200-400 | 5 | 4 |
| 400-700 | 2 | 6 |
| 700-1000 | 4 | 3 |
| 1000-1300 | 1 | 2 |
| 1300-1600 | 1 | 3 |
| 1600+ | 0 | 1 |
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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