Cumulative Summary

The Cumulative Summary section of the Survival Parameters tab is enabled when you mark the Cumulative Summary box in the Display section.

When you choose to display the Cumulative Summary on the Survival Parameters tab, tables will be included in your results matrix that display the statistics you select at each of the summary intervals you specify. The variables chosen on the Table tab define the page, row, and column headings. When selected for display, the Cumulative Summary tables are always at the beginning of the results matrix.

Intervals

Type the summary intervals you want to use in the Intervals field, or click Define to set your intervals in a certain pattern using the Define Summary Intervals dialog. If you type them in yourself, remember that the interval numbers must be in order from lowest to highest, and separated by commas. You cannot specify ranges. Your summary table will include the cumulative statistics for each interval you specify here.

Note that these intervals will not be updated automatically when you change the number of intervals or months per interval; you must remember to update them yourself. If you enter an interval number higher than the total number of intervals, SEER*Stat will issue an error message when you try to execute the session.

Starting with SEER*Stat version 6.0, the default interval length was changed to one month. The default values here were changed accordingly. Saved sessions from previous versions of the software will retain whatever values they were saved with.

Include Special Intervals/Conditional Survival

If the Include Special Intervals/Conditional Survival box is marked, then the requested statistics for each interval defined in the Special Intervals/Conditional Survival field above will be added to the summary table.

Include Median Survival

If the Include Median Survival box is marked, the Observed Median Survival and Relative Median Survival (if applicable for the Survival type selected) of the associated Life Page will be displayed in the Cumulative Summary tables.

Since there is only one Observed and one Relative Median Survival number per Life Page, the same values are displayed for each Survival interval displayed in the Cumulative Summary page.

Interval Dimension

When you choose to display the cumulative summary data, that data will be broken down by interval, as if each interval were a grouping in an additional table variable. Choose which dimension of the table this pseudo-variable should occupy by setting the Interval Dimension control to Row or Column.

Summary Statistics

Use the checkboxes at the bottom of the Cumulative Summary section to select the statistics you want to include in your cumulative summary table.

Any statistics you choose to calculate now can be hidden in the results matrix using the Matrix Options dialog. Statistics that you leave unmarked now will not be calculated during execution, and so will not be available in the matrix.

Example

Suppose you define a relative survival session with 120 intervals of 1 month each. You then select race and sex as row variables on the Table tab. Finally you specify "60,120" in the Intervals field on this tab, and check the box next to Relative. These choices will create a single summary survival page in the final matrix whose rows correspond to the sex and race combinations that define the life tables, and whose columns list the number of cases alive in the table (N) and the associated 60-month (5-year) and 120-month (10-year) relative cumulative survival.