Ann Turner and others not only counsel us to ignore segments <5cM but also to regard with great caution segments that are just >5cM, and even those that are >7.5cM but not by much. In other words, even some of the segments that qualify for a match here on FF and also on RF should be looked at skeptically.
I understand and appreciate this - but can't stop being curious! Specifically I'm curious about this: Is there any difference between a segment that doesn't qualify based on cMs versus a segment that doesn't qualify based on SNPs?
My wife shares a 27cM segment with someone who is not a match in FamilyFinder. I saw this on Gedmatch. Curious, looking further, I see that the segment spans only 360 SNPs! 27cM seems large; in fact my wife only has one other match (among 55 total matches) with a segment larger than that. It just seems odd to toss it out, but i understand if it doesn't meet the SNP threshold, it doesn't meet the threshold!
I've seen other segments via Gedmatch that are as many as 1500 SNPs (or even more - way above the usual thresholds of 500 or 700) but may only be 4.5 cM (or even less).
Are those two segments equally not worth looking at? (Equally meaningless insofar as reckoning a relationship)?
As always, thanks for your time & thoughts --
Dwight
I understand and appreciate this - but can't stop being curious! Specifically I'm curious about this: Is there any difference between a segment that doesn't qualify based on cMs versus a segment that doesn't qualify based on SNPs?
My wife shares a 27cM segment with someone who is not a match in FamilyFinder. I saw this on Gedmatch. Curious, looking further, I see that the segment spans only 360 SNPs! 27cM seems large; in fact my wife only has one other match (among 55 total matches) with a segment larger than that. It just seems odd to toss it out, but i understand if it doesn't meet the SNP threshold, it doesn't meet the threshold!
I've seen other segments via Gedmatch that are as many as 1500 SNPs (or even more - way above the usual thresholds of 500 or 700) but may only be 4.5 cM (or even less).
Are those two segments equally not worth looking at? (Equally meaningless insofar as reckoning a relationship)?
As always, thanks for your time & thoughts --
Dwight
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