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From: "Ken Nordtvedt" <>
Subject: Re: [DNA] : low variance MRCA dates for P310
Date: Sun, 28 Feb 2010 13:39:36 -0700
References: <mailman.7525.1267379596.2099.genealogy-dna@rootsweb.com><AC4DBC3BC3F34E95AD7C5C43DB2E6126@anatoldesktop>


----- Original Message -----
From: "Anatole Klyosov" <>

There is no reason to redefine them without a
> good (and a non-practical) reason.

[[ TMRCA is estimated for clades by average variance or GD from an assumed
founding haplotype.

Coalescence or Divergence age estimate of a clade is made from the average
tmrca of the N(N-1)/2 pairs of haplotypes of the sample collection.

The latter will be less than the former. I am sorry if the difference of
those two entities, conceptually or computationally, can not be seen. KN]]



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