ballpark_rank_of_mrca_between

ballpark_rank_of_mrca_between(first: Union[HereditaryStratigraphicColumn, HereditaryStratigraphicSpecimen], second: Union[HereditaryStratigraphicColumn, HereditaryStratigraphicSpecimen]) → float | None

Calculate a fast, rough estimate of the rank of the MRCA beteen first and second.

See estimate_rank_of_mrca_between for details.