Archiver > GENEALOGY-DNA > 2010-02 > 1267393736

From: "Ken Nordtvedt" <>
Subject: Re: [DNA] : low variance MRCA dates for P310
Date: Sun, 28 Feb 2010 14:48:56 -0700
References: <>

BV529 is the TMRCA age estimate for the node ancestral to both clades. So
"interclade TMRCA estimate" is fine and accurate.

The "AB" in the red GABw= was supposed to emphasize this was an interclade
age estimate for clades A and B.

You will note that at top of spreadsheet I call the separate clade estimates
Gcoales, with the coales supposed to be short for coalescence.
But for those who believed there was no distinction between coalescence age
and TMRCA I guess that achieved no end.

----- Original Message -----
From: "Tim Janzen" <>
To: <>
Sent: Sunday, February 28, 2010 2:37 PM
Subject: Re: [DNA] : low variance MRCA dates for P310

> Dear Ken,
> Thanks for your comments. It would appear that you prefer the term
> "self variance coalescence age estimate" for the output of BV9 and BV12.
> However you are using the term "TMRCA age estimate" for the interclade
> estimate in cell BV529. Is "TMRCA age estimate" your preferred term for
> the
> output of BV529? If so, I would prefer the term "interclade TMRCA age
> estimate" or "interclade TMRCA estimate" (the term I have been using all
> along) so that it is clear that the estimate is an interclade estimate and
> not an intraclade estimate.
> Sincerely,
> Tim
> -----Original Message-----
> From:
> [mailto:] On Behalf Of Ken Nordtvedt
> Sent: Sunday, February 28, 2010 1:19 PM
> To:
> Subject: Re: [DNA] : low variance MRCA dates for P310
> BV9 and BV12 are the self variance coalescence age estimates for the two
> separate clades.
> This could be verified by just tracing what the spreadsheet tabulates and
> combines. Note: there is no place for assumed founding haplotype on the
> spreadsheet, so that is the tip-off that a clade TMRCA from assumed
> founding
> haplotype is not being made.
> BV529 is the TMRCA age estimate for (common to) the two clades.
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