In a proportional hazards model, records that do not experience a failure during the observation time should be treated as censored (sometimes called right-censored).
To treat records as censored:
The number of records regarded as censored will appear to the right of the checkbox.
Records may also be censored if a default column is defined; this is useful if censored observations appear in one column, and non-censored observations appear in another column.
See also: