GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2010-01 > 1263169123


From: Alan R <>
Subject: Re: [DNA] R-L21 possible areas of origin
Date: Mon, 11 Jan 2010 00:18:43 +0000 (GMT)
References: <67160.60030.qm@web86602.mail.ird.yahoo.com><E570B994-44E1-4E18-9F4A-A437488F5D13@vizachero.com>
In-Reply-To: <E570B994-44E1-4E18-9F4A-A437488F5D13@vizachero.com>


Vince

Is it likely that the small sample from the continent and also from individual continental countries like France means that the changes of picking up the variation within in L21 there is reduced?  Will this potentially effect the calculations?   

cheers
Alan


Vince said
It may not.

Variance-based TMRCA estimates are inescapably noisy (which is why they have such wide confidence intervals).  When the sample changes, the estimate will change.  If true TMRCA in  two populations is roughly the same, then TMRCA estimates from samples of the two are always going to bounce around near (but almost never at) the actual TMRCA.

VV


On Jan 10, 2010, at 5:09 PM, Alan R wrote:

> The detail of which area is oldest within the isles has changed with each dating attempt.  Is this down to inadequate sampling previously?  At what point will this settle down into a consistent pattern?

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