**Calculation Using Case Data : ** All rows have 3 columns

- Each row represents data from a case

- Col 1 designates groups, 1,2,3, and so on

- Col 2 is the number of intervals (seconds, hours, year, periods) the subject
is in at the time of analysis

- Col 3 is a single number. 0 represents that the subject had the index event
(death, recurrence, discharge)

during that interval, any other number represents that the subject has survived up to and

including the interval

**Calculation Using Event Table : **

- The rows are intervals (periods, days, years).

- The columns designate events, each group has 2 columns, the first the number of subjects that

experienced the index event during that interval (death, discharge, arrived),

the second the number that survived that interval without the index event.