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Archiver > GENEALOGY-DNA > 2005-06 > 1117916620


From: (John Chandler)
Subject: Re: [DNA] R1b - 23/11/13 Motif
Date: Sat, 4 Jun 2005 16:23:40 -0400 (EDT)
References: <060420050711.19298.42A154270005A97100004B622207021553050B989A0E00@comcast.net>
In-Reply-To: <060420050711.19298.42A154270005A97100004B622207021553050B989A0E00@comcast.net>(fauxdk@comcast.net)


David wrote:
> The data are listed from highest 23/11/13 relative to
> 24/11/13 percentages to the lowest:
>
> East Norway - 100%
> Friesland (Holland) - 78%
> Denmark - 59%
> Germany - 46%
> England - 28%
> Ireland - 23%
> Spain - 16%

One other thing you need to report is the sample size in each case.
Take the English case, for example. If there are only 50 haplotypes
included in that datum (i.e., the 28% = 11 relative to 39), then there
is a rather substantial statistical uncertainty on the percentage
(almost 8 percentage points). If that were true of all of these
geographic samples, then the difference seen between the English and
Spanish samples wouldn't be statistically significant. If, on the
other hand, there were 500 haplotypes in each sample, then these
differences would actually mean something.

Version 1: big samples -> English R1b is about 75% "Spanish" type and
25% Frisian type.

Version 2: small samples, one extreme -> English R1b is 100% "Spanish".

Version 3: small samples, other extreme -> English R1b is 30% "Spanish"
and 70% Frisian.

In short, with small samples, you can't really draw any conclusions
at all. So, which is it?

John Chandler


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