Also related is the unseen species problem (if you sample N things, and get Y repeats, what's the estimated total population size?). https://en.wikipedia.org/w

Also related is the unseen species problem (if you sample N things, and get Y repeats, what's the estimated total population size?). https://en.wikipedia.org/wiki/Unseen_species_problem https://en.wikipedia.org/wiki/Unseen_species_problem http://www.stat.yale.edu/~yw562/reprints/species-si.pdf http://www.stat.yale.edu/~yw562/reprints/species-si.pdf