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Archiver > GENEALOGY-DNA > 2010-12 > 1292190235


From: "Lawrence Mayka" <>
Subject: Re: [DNA] NW European R1b from Iberia?
Date: Sun, 12 Dec 2010 15:44:16 -0600
References: <0A965AA0-40C8-44B3-9C79-A9EB11938E05@vizachero.com><201012090942.oB99gNdL003003@mail.rootsweb.com><AANLkTi=71WHCmdKtNxFKt2KbkhLfiHqFFMnHXHVonfCL@mail.gmail.com><00ab01cb9a25$c733a870$c2482dae@Ken1> <5272EE90-DA80-4E67-89CB-EFDF060D5467@vizachero.com><00e301cb9a31$d03684e0$c2482dae@Ken1>
In-Reply-To: <00e301cb9a31$d03684e0$c2482dae@Ken1>


No, because a paragroup does not participate as "cleanly" in interclade age
calculations.

An interclade age calculation between R-U152 and R-L21 is "clean," in the
sense that they have a specific interclade MRCA, older than the MRCA of
either one, and the calculation is an unbiased estimate of that MRCA's age,
regardless of the region from which one draws the samples.

In contrast, an attempted interclade age calculation between R-U152 and
R-P312* is "messy," in the sense that the actual MRCA depends on the choice
of R-P312* samples. An interclade calculation between the R-U152 and
R-P312* in Spain is probably estimating the age of a _different_ individual
from that of an interclade calculation between the R-U152 and R-P312* in
Poland. Even for a given region, the calculated estimate may vary depending
on the specific mix of samples.

> From: [mailto:genealogy-dna-
> ] On Behalf Of Ken Nordtvedt
> ALMOST anything you can warn about
> so-called paragroups can happen to what you call bonified groups as well,
> such as geography, clade, etc..... complications. KN



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