**Select menu: Stats | Survival Analysis | Life-table**

Calculates the life-table estimate, or actuarial estimate, of the survivor function. The life-table method requires a fairly large number of observations so that survival times can be grouped into intervals.

- After you have imported your data, from the menu select

**Stats | Survival Analysis | Life-table**. - Fill in the fields as required then click
**Run**.

You can set additional Options then after running, you can save the results by clicking Save.

## Available data

This lists data structures appropriate to the current input field. It lists variates for specifying the time-points, censoring and frequencies, and factors for the groups. The contents will change as you move from one field to the next. Double-click on a name to copy it to the current input field or type the name.

## Time measurements

Specifies the form of the time measurements for calculating the life-table. The options are:

Actual time points |
Data are supplied using actual time points |

Time-intervals |
If there are several observations (all censored or all uncensored) at a time point, the data should be supplied using the time point only once and by supplying the number of observations within a variate of counts in the Frequency field. |

## Time points

Specifies the time points at the end of each interval for Time-interval data or the actual time points for Actual time point data.

## Censored

Variate containing the values 0 and 1 to indicate whether the corresponding time point is censored (1) or not (0).

## Frequencies (Time-intervals only)

Variate containing counts of the number of censored or uncensored observations at each time-interval.

## Groups

Specifies a grouping factor that can be used to request separate life tables for different groups of data.

## Interval(s)

Specifies the boundaries or widths of the intervals. For equal intervals, you can supply a scalar to define their width. Alternatively you can supply a variate containing the lower boundaries of the intervals.

## See also

- Life Table Options
- Life Table Save Options
- RLIFETABLE procedure
- Kaplan-Meier (Exact time points) for calculating the Kaplan-Meier estimate for actual time points
- Kaplan-Meier (Interval based) for calculating the Kaplan-Meier estimate for time-intervals