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Chapter 15: Data Analysis
Enter a Confidence Level to be used when computing errors for the survivorship function and for the upper
and lower limits of the quartile estimates. The decimal value entered must be greater than 0 and less than
1.
8) The Results Group
Select the Advanced check box if you want the survivorship function output in the Results Log.
Select the Worksheet check box if you want the survivorship function and quartile estimates to be output in
a worksheet.
Select the Plot check box if you want a plot of the survivorship function.
Select the Errors check box if you want the errors of the survivorship function to be plotted along with the
survivorship function as confidence bands (Kaplan-Meier Estimator only).
9) The Compute Button
Click the Compute button to perform the indicated computations on the selected Time Variable, Censor
Variable, and Covariates (Cox only) data sets. All settings can be changed and the Compute button can be
clicked as many times as desired without closing the dialog box. Results are output as indicated in the
Results Group.
Example: Running the Kaplan-Meier Product-Limit Estimator
1) To run the Kaplan-Meier Product-Limit Estimator, open the Origin sample project file SURVIVAL
ANALYSIS.OPJ located in the Origin \SAMPLES\ANALYSIS\STATISTICS subfolder.
2) Activate the Data1 worksheet and select Statistics:Survival Analysis:Kaplan-Meier Estimator to
open the Kaplan-Meier Estimator dialog box.
3) Highlight the data set Data1_Time in the Available Data list box and then click the Select Time
Variable data set (right-arrow) toolbar button.
4) Highlight the data set Data1_Censor in the Available Data list box and then click the Select Censor
Variable data set (right-arrow) toolbar button.
5) Click the Toggle Censor Value button if needed to toggle the selected Censor Value from 0 to 1.
6) Enter a Confidence Level of 0.90.
7) Make sure all four check boxes in the Results Group are selected and then click the Compute button.
The Kaplan-Meier Estimator runs, outputting the Summary of Event and Censor Values, the Survivorship
Function, and Quartile Estimates in the Results Log and in a Survival worksheet. The Survivorship
Function and Confidence Bands (upper and lower confidence limits) are plotted in a SurvivalPlot graph.
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