Comparing Survival in Two Groups - Analysis Tab

The Analysis tab of the Comparing Survival in Two Groups dialog box contains options to specify the variables for the analysis.

Variables (survival times, censoring indicator, grouping variable). Click the Variables button to display the standard variable selection dialog box, which is used to specify the variable(s) with the survival times, the censoring indicator variable, and the grouping 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. In this field, enter the codes or text labels that are used in the censoring indicator variable to uniquely identify complete (uncensored) observations. 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. In this field, enter the codes or text labels that are used in the censoring indicator variable to uniquely identify incomplete (censored) observations. 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 first group. In this field, enter the code or text label used in the grouping variable to uniquely identify to which one of the two groups each observation belongs. 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 second group. In this field, enter the code or text label that was used in the grouping variable to uniquely identify to which one of the two groups each observation belongs. 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.