Life Table

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.