Going through my list of matches I'm working on a triangulation analysis. (Such that if person A matches from position 10-15 and person B matches from position 10-13 I can break out position 10-13=A&B, 14-15=A.
I want to weight each segment by cM and I figured I can derive some segments using subtraction. For example the cM for 14-15 would be the cM of 10-15 minus the cM for 10-13 as reported by 23andMe.
However I see that 23andMe is giving me different cM values for the same segment in some cases. Example below:
What does this mean? In the same test why would there objectively be a different distance for 2 people between 8,307,849 and 12,628,471?