GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2007-12 > 1197155191


From: "Lawrence Mayka" <>
Subject: Re: [DNA] E3b1a2 V13+ SNP-tested modal posted to YSearch
Date: Sat, 8 Dec 2007 17:06:31 -0600
In-Reply-To: <BAY105-W4409EF6C4440EF319E716CC690@phx.gbl>


I feel obliged to point out that basing a modal solely on those who have
paid a substantial price for an additional deepSNP test (beyond the regular
deepSNP-E3b which many customers already purchased) has a significant
selection bias--i.e., in favor of those who have more disposable income, a
more compelling interest in genetic ancestry, etc. To some extent, of
course, this bias cannot be avoided, simply because our extended-haplotype
databases come from customer-paid testing; but we should all be aware of it.
After all, a modal is simply a vote taken among those who can afford the
poll tax and have the time, interest, and knowledge to go to the polls.

In this case, it appears that generally, the differing alleles in the new
JNN7F are more common in the British Isles but rarer on the Continent. This
is not a criticism of Steve's excellent work, which is certainly one
reasonable way to construct a modal; but it is sufficient reason for me to
leave my modal in Ysearch as well.

> [mailto:] On Behalf Of Steven Bird
> I've uploaded a 67 marker modal that I derived
> (using Excel) from these 56 SNP-tested V13+ haplotypes in our
> database (as of 11 28 07) to YSearch.
..
> There are some small departures from Larry Mayka's
> earlier effort, which was based upon assumed E3b1a2
> haplotypes, prior to the availability of V13 testing. (Y
> Search ID: SBAFW)Changes that occurred were: DYS456, from
> 17 to 18DYS 570, from 19 to 20CDYa, from 31 to 30CDYb, from
> 34 to 37 (!)


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