**Survival Parameters Tab**

Use the Parameters tab in a Survival
session to specify the survival duration information, intervals, and
vital status involved with the calculation of survival duration, as well
as whether to display Case Listing information or Standard Life, Cumulative
Summary, and/or Z-test tables.

#### Survival Duration, Interval, and Vital Status

The survival duration parameters establish if survival time will be
computed by SEER*Stat or if a field containing pre-calculated survival
duration will be used.

The survival duration for each case is then partitioned into the defined
survival duration intervals. For every life table, SEER*Stat calculates
the number of cases alive at the beginning of each survival interval.
A case is counted as entering the first interval alive, and either survives
into the next interval, or its survival time terminates somewhere within
the current interval. If the case does not survive into the next interval,
it is either counted as dying during the current interval, or its vital
status indicates that it is alive, but does not have enough survival time
to go into the next interval. In the latter case, it is counted as lost
to follow-up during the interval.

Cases that are alive and have zero survival durationare deleted from
the analysis since the survival time is zero unless the Presumed Alive
option is set. The number of cases for which survival could not be calculated
is included in the Information section of the Matrix
Properties.

If using dates a case has zero survival if the begin and end dates match.
For pre-calculated, there is a flag associated with the selected
duration variable. While the duration field may only be available
in months, the flag will allow SEER*Stat to only consider zero days as
zero survival. In this case, there can be cases lost to follow-up
in the first monthly interval.