Several methods are available for the imputation of missing values . A summary of currently used methods is presented in Table 3.3.
For example, in the Heart Failure End-of-life project, the following fallback sequence was used to backfill missing first diagnosis dates:
- most recent Pacemaker Date,
- first AICD date,
- most recent ejection fraction measurement date,
- most recent cardiologist visit date,
- most recent contact date.