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Archiver > GENEALOGY-DNA > 2008-07 > 1215640141


From: "Ken Nordtvedt" <>
Subject: Re: [DNA] calibrating for common ancestor - QUESTION?
Date: Wed, 9 Jul 2008 15:49:01 -0600
References: <936471110807091219n1e817524o7f64ec98109e861d@mail.gmail.com><EE24A346-05E7-49A7-9A54-9297A9C3AB1A@vizachero.com><3b2a446a0807091341l2069ab5bv151dc01c00f726d7@mail.gmail.com><002501c8e205$158ff950$6400a8c0@Ken1><79d120de0807091350h13b1da0aie12828248de80d4c@mail.gmail.com>


Only semi-statistical, and I think many can follow the method. It depends
on looking for correlations in the distributions of all pairs or obviously
important pairs of markers. If knowing the repeat value of one marker
alters your knowledge of the distribution of another marker, they have
correlated distributions. If not, they are uncorrelated. If there are not
two or more clades hidden in the sample population, all pairs of markers
should have uncorrelated distributions. (There is one exception to this but
I won't go into that right now). Setting up little distribution matrices
for pairs of markers is the way to see if they are correlated or not. These
matrices have entries which are the haplotype counts C(ra,rb) = the number
of haplotypes with marker a having ra repeats and marker b having rb
repeats.

Ken

----- Original Message -----
From: "adam bradford" <>
To: <>
Sent: Wednesday, July 09, 2008 2:50 PM
Subject: Re: [DNA] calibrating for common ancestor - QUESTION?


> I'd love to know what those ways are. But I'm afraid they will be
> statistical formulae, which is like a foreign language to me.
>
> On Wed, Jul 9, 2008 at 4:48 PM, Ken Nordtvedt <>
> wrote:
>
>>
>>
>> There are more direct ways to test a cluster for being descendants of a
>> single MRCA or not, and which don't suffer from circular logic problems.
>>
>>
>>
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