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Chapter 15: Data Analysis
4) The Covariates List Box (Cox Proportional Hazards Model only)
Contains one or more selected Covariate data sets. Each Covariate data set is paired with the Censor and
Time Variable data sets and must contain precisely the same number of data values. Covariate data set
values are Real Numbers but can also be Categorical (e.g. indicate the presence of a condition or
characteristic by using the value 1 and the absence of a condition or characteristic by using the value 0;
indicate the level of a characteristic by using consecutive integers, etc.). De-select selected Covariate data
sets by highlighting them in the Covaiates list box and then clicking the appropriate left-arrow toolbar
button.
5) The Censor Value Edit Box
Contains the currently selected Censor Value chosen from one of the two unique values contained in the
Censor Variable data set. The Censor Value identifies which time values in the Time Variable data set are
censored. An observation having a censored time value represents some outcome other than failure such as
prematurely leaving the study due to chance factors or surviving beyond the completion of the study.
6) The Toggle Censor Value Button
Click the Toggle Censor Value Button to choose the Censor Value from one of the two unique values
contained in the Censor Variable data set.
7) The Confidence Level Edit Box (Kaplan-Meier Estimator only)
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