This parameter can be used to modify the behaviour of the function.
Family Historian will use any dates it can in a persons record for preference. If it doesnt find any, it will normally check parents and childrens dates, and try to calculate death dates from these. If still no luck, it will normally check grandparents, and grandchildrens dates. How many generations up or down it will continue to check, if closer generations have no dates to work from, depends on the value set here. If you set this to a high value (e.g. 10) some individuals who previously had no estimated death date (because nothing to go on), may now have an estimate.
The higher the value used, the more results returned you can expect. But the range between the EARLIEST and LATEST values in these cases is likely to be large, and the function may run slower. You can set this value to 0 if you want fewer, more accurate results.
=EstimatedDeathDate(%INDI%, EARLIEST) or =EstimatedDeathDate(%INDI%, LATEST, 9)