Handling relative dates

Hi @mlterryMitre,

If you do not need to do seasonal studies (e.g. real month and year) just shift each birthdate by a random number ± 10 years or so. Recompute the dates of all the other events according to that. The dates are meaningless now but the sequence of events is preserved. You will have cases where the medication will appear before they hit the market but that it is ok I believe. This will also misrepresent the number of people in a given period of time. However, both of those issues are exactly the same as using the “relative dates” you mentioned.

That is similar to the approach that is described in this forum for people over 89 but without truncation.