ballpark_ranks_since_mrca_with

ballpark_ranks_since_mrca_with(focal: Union[HereditaryStratigraphicColumn, HereditaryStratigraphicSpecimen], other: Union[HereditaryStratigraphicColumn, HereditaryStratigraphicSpecimen]) → float | None

Calculate a fast, rough estimate of generations elapsed since MRCA with other.

See estimate_ranks_since_mrca_with for details.