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Archiver > GENEALOGY-DNA > 2010-12 > 1292190853


From: "Ken Nordtvedt" <>
Subject: Re: [DNA] NW European R1b from Iberia?
Date: Sun, 12 Dec 2010 14:54:13 -0700
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><068a01cb9a45$b9f25b00$2dd71100$@org>


----- Original Message -----
From: "Lawrence Mayka" <>


> 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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