GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2006-02 > 1139125044


From: "John McEwan" <>
Subject: RE: [DNA] R1b SNP page updated
Date: Sun, 5 Feb 2006 20:37:24 +1300
In-Reply-To: <BAY101-F16067FFF838977DF0B8171A90C0@phx.gbl>


Dear Ian

Thanks for this, I know that databases like Ysearch have errors. I have
tried to minimise them by picking those with 37 FTDNA STRs because I
know most automatically enter the values from FTDNA and those that do 37
markers are usually pretty serious about it and often run surname
projects. I also notice some have the wrong haplogroup written in (but
probably <1%) and origins are a bit dubious for some. I manually had to
group nearly 4000 individuals so detailed exploration of GEDCOMs was
out. My personal preference is to use surnames, but I am still "working
up" to that level. The tables I released yesterday should have been done
months ago, they are an internal check that I will use when I do a study
based on surnames. Specifically, I will check examples where origin
based on surname and stated origin differ.

I am sure some just guess regards their origin.

I know that if we can keep errors below about 1 in 20 then they will not
compromise the results.

Ysearch will never be as comprehensive geographically or have as good a
QC as SMGF, but it is useful.

Cheers

John

-----Original Message-----
From: Ian Kennedy [mailto:]
Sent: Sunday, 5 February 2006 11:35 a.m.
To:
Subject: RE: [DNA] R1b SNP page updated

John, thanks for all the hard work. When you have a spare moment (!),
have
you tried this, as I have; pick a few of the ysearch participants who
have
posted gedcoms or even just footnotes and cross check the data against
their
stated country of origin. I do this first and in my own analysis only
count
it as even a stated country of origin if these pieces of information
match
up. I know at least one person I have been in contact with who is
actually
brickwalled in the States has put down Ireland as their country of
origin;
and another person I can think of has put down Ireland as their country
of
origin when the gedcom paternal line actually goes back beyond the
Plantation era to Scotland!

(I'm not picking on the Irish by the way - there may equally well be
examples the other way around).

Ian Kennedy
Scotland

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