Hi,   I'm trying to find a way to identify the level of crossover between groups of individuals in my data.   For a dataset like: Group ID Individual ID 1 A 1 B 1 C 1 D 2 A 2 B 2 C 3 D 3 E 3 F   I'd like to be able to do something that would highlight any groups that share the a certain percentage of their members. So here'd I like to flag that for Group 1, 75% of it's members are also in Group 2, and so there's a connection between these groups, but only 25% of its members are in group 3 and so there isn't a connection here. Obviously the real data is much larger than the example above, and I'd want every group to be compared against every other one (so that a link between Group 2 and Group 1 would be flagged as 1 contains 100% of 2, and no link between 2 and 3 would be flagged as 3 contains 0% of 1).   I'm stumped as to how to do it though, or if this is even something that is possible. Any help would be much appreciated. ... View more