DISCUSSION

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How close a match do I need to be considered "related" to another person?

This is an excellent question.  FamilytreeDNA has analyzed tens of thousands of samples and matches, and has determined that two individuals will either be considered "related," "probably related," or "not related," based on how closely the two peoples' results match. This is complicated a little by the fact that some markers mutate faster than others, so a match of 35 out of 37 markers could still indicate a very close relationship if the two markers that are different are fast changing markers.  These charts below adapted from FamilytreeDNA data should help you establish whether you and another Robb, Raab, Raub, Roup, etc. are related based on your test results:

67 Marker Tests:

67/67                 Distance of 0         Very tightly related

65/67 or 66/67     Distance of 1 or 2   Tightly related

61/67 to 64/67     Distance of 3 to 6   Related

60/67                 Distance of 7          Probably related

58/67 or 59/67     Distance of 8 or 9   Only possibly related

57/67 or less        Distance of 10 +     Not related

37 Marker Tests:

37/37                 Distance of 0          Very tightly related

36/37                 Distance of 1          Tightly related

34/37 to 35/37    Distance of 2 to 3    Related

33/37                 Distance of 4          Probably related

32/37                 Distance of 5          Only possibly related

31/37 or less       Distance of 6 +       Not related

25 Marker Tests:

25/25                 Distance of 0          Related

24/25                 Distance of 1          Related

23/25                 Distance of 2          Probably related

22/25                 Distance of 3          Probably not related

21/25                 Distance of 4          Not closely related

20/25                 Distance of 5          Not related in last 2000 years

19/25                 Distance of 6          Not related in last 5000 years

18/25 or less       Distance of 7+         Totally unrelated

12 Marker Tests:

12/12                 Distance of 0          Probably Related

11/12                 Distance of 1          Possibly related

10/12                 Distance of 2          Probably not related

7/12 to 9/12        Distance of 3 to 5   Not closely related

6/12 or less         Distance of 6+        Totally Unrelated