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Archiver > GENEALOGY-DNA > 2010-02 > 1267154402


From: "Lewis Townsend" <>
Subject: Re: [DNA] Clerical mutations and lab errors
Date: Thu, 25 Feb 2010 22:20:02 -0500
References: <REME20100225202615@alum.mit.edu><DC80EAA449454E3B95A30D232870F3F6@HP>


All good points.

An option that I use is that instead of a co-administrator I have a back up
admin who knows all and has access to all - in case I drop - but this person
is not listed as co-admin.

Lew

----- Original Message -----
From: "Diana Gale Matthiesen" <>
To: <>
Sent: Thursday, February 25, 2010 9:06 PM
Subject: Re: [DNA] Clerical mutations and lab errors


>I have long advocated, for other reasons, that project admins open the
>default
> web site provided by FTDNA, even if they also provide a personal web site
> for
> the project. Those reasons are:
>
> 1. It provides continuity for the project if the admin drops out of the
> picture, making it much easier for a new admin to take over, especially if
> the
> personal web site goes offline. Yes, a co-admin is a good idea to
> accomplish
> the same end, but not everyone wants a co-admin.
>
> 2. Test results are available to researchers immediately, rather than
> being
> delayed by the admin having to upload them to their personal site.
>
> 3. It provides FTDNA's "current take" on the haplogroup as SNP tests are
> taken
> and/or as the haplotree is revised, something I've found some admins are
> not
> good at updating on their personal sites.
>
> 4. It's a cross-check for typos on the personal site.
>
> And now you've given us another reason.
>
> Please folks, it only takes a little effort to set up the default FTDNA
> web site
> for your projects. If anyone needs help on the options, I'll be happy to
> help,
> but I will request that you ask me on my Y-DNA-PROJECTS list (your joining
> the
> list will be my reward for the time and effort):
> http://lists.rootsweb.ancestry.com/index/other/DNA/Y-DNA-PROJECTS.html
>
> Diana
>
>> -----Original Message-----
>> From: On Behalf Of John Chandler
>> Sent: Thursday, February 25, 2010 8:36 PM
>> To:
>> Subject: [DNA] Clerical mutations and lab errors
>>
>> I have a statistic that may interest some of you. In 2008, I visited
>> a large number of Y DNA project web pages and collected a substantial
>> number of 67-marker haplotypes -- about 10,000 in all -- in my effort
>> to get an improved set of relative mutation rates. Alas, I found that
>> number to be still too few. Recently, I began revisiting most of
>> those same projects to expand my collection, and, because it is
>> easiest to collect everything during a visit, I now have two snapshots
>> separated by almost two years. About 9,000 haplotypes appear in both
>> snapshots, and nearly all of them are the same both times -- but not
>> quite all. 25 have changed in the meantime, and 10 of those 25 are in
>> projects with www.ftdna.com/public pages that provide a direct window
>> into the FTDNA results database. Indeed, about 8,000 of the
>> haplotypes in play were found in such projects.
>>
>> Note: the duplicate haplotypes found for testees who belong to
>> multiple projects have been weeded out. These are 8,000 distinct
>> haplotypes.
>>
>> Thus, I have a reading on the discovery rate for lab errors, including
>> clerical errors at the lab: 1 per 800 haplotypes. You can divide by
>> 67 if you want the per-marker error rate, but I don't have enough
>> events to say how the error probability is distributed among the
>> various markers. It's surely not distributed evenly.
>>
>> Note the much higher error rate (including clerical errors by project
>> webmasters) for the results found only on privately maintained web
>> sites: 1 per 67 haplotypes.
>>
>> RECOMMENDATION: even though your project may have members who tested
>> at other labs besides FTDNA, go ahead and set up a "public" web site
>> at FTDNA as well.
>>
>> John Chandler
>>
>>
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