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Archiver > GENEALOGY-DNA > 2004-05 > 1083514839


From: "John A Hansen" <>
Subject: RE: [DNA] DNA Matches > Scottish Matches
Date: Sun, 2 May 2004 09:20:39 -0700
In-Reply-To: <4094D5EB.5450.5A2628C@localhost>


Steve:

Thanks for your comments.

Your 24/25 DNA matchs would certainly indicate that line
would be a good candidate to keep searching. The question
on the one mismatch would relate to which marker ( since
some mutate faster than others).

I use a "sum of squares" criteria. That basically means that
you take the mismatches and:
A: square the difference (ie a mismatch of 2 = 4)
B: Add up all the numbers
A score of under 4 is usually a pretty good indication of a
potential match. This is somewhat dependant on the rate
of mutation as well. There are lots of good papers on the
net that delve into this algorithm in great detail if you
really want to get into statistics etc.

So the 32 of 37 match would be doubtful ( IMHO.)

But I would take the 24/25 match and expand it to the 37
marker test since that is at least a likely suspect to see
what you get.

Our Scottish DNA database is available for analysis as
well and we are happy to share with those that are
also willing to share data :-).

Best Regards
John A Hansen


-----Original Message-----
From: Steven C. Perkins [mailto:]
Sent: Sunday, May 02, 2004 9:05 AM
To: John A Hansen;
Subject: Re: [DNA] DNA Matches > Scottish Matches


John:

I am a 24/25 match to the alleged Somerled set of markers. Outside of
three Perkins cousins, I have 1 24/25 match and 5 23/25 matches. All with
Scottish surnames. So far only one has had a 37 marker test and we
matched 32/37. Until one of the MacDonalds tests, I am not sure that
23/25 or 24/25 matches with differing surnames actually lead to a
connection by descent as opposed to an "identical by state" situation.

Regards,

Steven C. Perkins


On 2 May 2004 at 8:17, John A Hansen wrote:

Date forwarded: Sun, 02 May 2004 09:18:06 -0600
Date sent: Sun, 02 May 2004 08:17:08 -0700
Forwarded by:
From: John A Hansen <>
Subject: [DNA] DNA Matches > Scottish Matches
To:
Send reply to:

>
> Dear Don:
>
> I would think that a 25/25 match would certainly indicate
> that you would want to focus a lot of effort on that precise
> tree. There is some potential for misleading but at this
> point I would even recommend upgrading to the new
> 37 marker test for that analysis!
>
> Your odds of actually finding a written genealogy trail
> amongst those 25/25 matches is certainly a lot more
> probable than merely trying to connect two uncertain
> suspected matches that have no certain connection.
>
> My strong recommendation is to also use DNA testing as
> verification of the standard genealogy research due
> to the occasional mysterious paternity events and
> other human mistakes that have mislead genealogist
> for hundreds of years.
>
> BTW: The Scottish DNA study does share information and
> the participants are eager to match their written records with
> anyone that even comes close to a match. Some of these
> written ( and proven) genealogy ancestry records go back
> hundreds of years.
>
> Best Regards
> John A Hansen
>

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