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Archiver > GENEALOGY-DNA > 2011-03 > 1300379690


From: "A. J. Levin" <>
Subject: [DNA] NPE rate
Date: Thu, 17 Mar 2011 09:34:50 -0700 (PDT)
In-Reply-To: <mailman.381.1300345245.9142.genealogy-dna@rootsweb.com>


Diana:

Is this an "NPE rate" or an aggregate NPE/bad-genealogy rate?

I suspect the latter based on the number of false and absurd trees I have seen. Your rate is nearly three times higher than the median number that the classic peer-reviewed article on the subject found:

http://jech.bmj.com/content/59/9/749.long

Of course, it's possible your projects happen to cover particularly adulterous parts of the globe.

In specific cultures and countries/regions, though, having different haplogroups with the same surname is much less likely to point to an NPE than to be the product of recent or parallel surname adoption, deliberate surname change, or local naming practices that may not follow the Y line. I would be very much surprised if two randomly chosen Johanssens, Smiths, Liangs, Poborskies, or Kaplans _did_ match each other even at 25 markers.

A.J.

----------------------
Date: Wed, 16 Mar 2011 23:45:53 -0400
From: "Diana Gale Matthiesen" <>
Subject: Re: [DNA] Assistance with 66/67 match in I2b2-D
To: <>

The NPE rate in my surname projects is running close to 10%, so I'm
quick to suspect one when you have a 66/67 match outside your surname.



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