Feature request: summary of cause-specific censoring for CohortMethod module

[jmb01]

It would be helpful for interpreting CohortMethod results if there was information available on the number of patients in the target and comparator groups censored for various reasons at various time-points during follow-up. Ideally, this could take the form of a table with one row per day on which a censoring event occurs, with the number of patients censored for each reason in the columns. This can be visualized in a similar manner to a Kaplan-Meier. There seem to be at least seven types of censoring, including:

1. end of observation period
2. death (if available)
3. discontinuation of treatment
4. custom criteria specified in the cohort definition
5. switching to or adding comparator treatment (i.e., the type done by CohortMethod)
6. end of the TAR window
7. outcome event occurrence

However, this seems like a complex task as different types of censoring take place in different modules, and one type may be superseded by another at a later step in the analysis. For example, a patient may be censored 100 days after cohort start due to a custom rule in the cohort definition, then censored further in a CohortMethod analysis where the TAR is set to [cohort start + 1, cohort start + 90]. Furthermore, causes 1-4 above seem to be all rolled into the cohort end date, with no easy way to retrieve them from current output.