Archiver > GENEALOGY-DNA > 2010-02 > 1267389076

From: "Ken Nordtvedt" <>
Subject: [DNA] Fw: : low variance MRCA dates for P310cladesinItalyandSEEurope
Date: Sun, 28 Feb 2010 13:31:16 -0700

I forgot to add that the Generations excel spreadsheets evaluate
self-variance of clades, not variance of haplotypes with respect to assumed
founding haplotype. Only the latter would be an estimate of clade TMRCA.

>I have never called my intraclade age estimates TMRCAs because they are
>not; they are either coalescence or divergence age estimates, with those
>two latter terms used interchangeably in the literature depending on the
>authors and their sense of time and desire to be technically precise.
> Why you would believe that two different age estimates can be
> interchangeable, even in name, with each other escapes me?
> ----- Original Message -----
> From: "Tim Janzen" <>
>> Dear Ken,
>> All of the estimates I gave in my last message are intraclade TMRCA
>> estimates. Yes, they are coalescence age estimates. I agree with Steve
>> Bird that these two terms can be used interchangeably.

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