Life Table & Distribution of Survival Times - Raw Data Tab

Select the Raw data tab of the Life Table & Distribution of Survival Times dialog box to access options to specify how the raw data will be used for input into the analysis.

Variables (survival times & censoring indicator). Click the Variables button to display a variable selection dialog box for specifying the variable(s) with the survival times and the censoring indicator variable.

Specifying survival times. There are three ways to specify survival times. Select one variable with survival times (e.g., number of weeks surviving), select two variables containing the start and end dates respectively, or select six variables containing dates. Specifically, these variables should contain the month (1 to 12), day (1 to 31), and year when the particular observation began (e.g., when the patient was admitted to the hospital), and the month, day, and year when the observation was terminated (due to death/failure or censoring, e.g., when a patient was dismissed from the hospital). While processing the data, Survival Analysis will compute the number of days that elapsed between dates and perform the analysis on this measure. Note that if the value of the year is less than 100, Statistica will automatically assume that the year refers to the 20th century; for example, the year 88 will be converted to 1988.  

Code for complete responses. Enter the codes or text labels that were used in the censoring indicator variable to uniquely identify complete (uncensored) observations in the Code for complete responses field. To review all codes in the respective variable, double-click on this field (or press the F2 key on your keyboard) to display the Variable dialog box.

Code for censored responses. Enter the codes or text labels that were used in the censoring indicator variable to uniquely identify incomplete (censored) observations in the Code for censored responses field. To review all codes in the respective variable, double-click on this field (or press the F2 key on your keyboard) to display the Variable dialog box.

Compute table based on. The options under Compute table based on are described below.

Number of intervals. Select the Number of intervals option button and use the accompanying field to enter the number of intervals for the life table.

Stepsize (interval width). Select the Stepsize option button and use the accompanying field to enter the step size that is to be used for tabulating the survival times.