Unfortunately, very few testers on 23andMe and FamilyTreeDNA have uploaded a GEDCOM file to those systems, so I cannot compare my GEDCOM file with those of many of my matches.
There are other DNA analysis tools that I am just starting to investigate. Several months ago, I downloaded a spreadsheet file of my autosomal DNA test results from 23andMe. FamilyTreeDNA and AncestryDNA have this feature also. I then uploaded it to GEDMatch (www.gedmatch.com) and waited several months for the results. I checked it again today, and saw that I could use the site.
Here is the GEDMatch.com home page - I signed in and saw:
This page tells my GEDMatch kit number (in this case, it's my 23andMe kit number) in the left-hand column. In the right-hand column, there is a section to upload my DNA raw file (which I've already done). Below that is the "Analyze Your Data" box with links to:
* 'One to many' matches
* 'One-to-one' compare
* X 'One-to-one'
* Admixture (heritage)
* Admixture/Oracle with population search (New)
* DNA File Diagnostic Utility
On the right side of the right-hand column is a section for GEDCOM files (I haven't uploaded one yet) and Miscellaneous utilities.
For this post, i'm going to look at the 'One-to-many' DNA comparison and the 'One-to-one' comparison.
Here is the screen for the 'One-to-many' comparison - I needed to enter my kit number:
After clicking the "Display results" button, I saw the top of the page for "DNA Matches to Kt No. M......):
On the screen above, there are several buttons - one to see the Chromosome Browser comparison, another to see an Autosomal Matrix comparison, and a third for an X-DNA comparison.
Further down the screen is a table of autosmal DNA kits that have some matching segments (at least 7 centi-Morgans).
The columns show the kit number, a "select" check box, sex, Mt and Y haplogroups, Autosomal DNA (total cM, largest cM, and generations), X DNA (total cM and largest cM), kit owner's name, and the kit owner's email.
When the user first sees this table, it is ranked with the highest Autosomal Total centi-Morgans. The table can be ranked by choosing any of the blue up or down arrows in the columns:
Note: I truncated the graphic above to hide most of the kit owner names and email addresses.
The user can select (check) at least two of the profiles to be compared to his/her own profile. I chose the first ten on the Total autosomal list above (two were duplicates), and scrolled up and clicked to see the "Chromosome Browser" button. Here's the top of the page:
The graphic tells me the person(s) that I match on each chromosome, and defines the matching segments, and any overlap with a previous match on the list.
Further down is the persons that I match on Chromosome 15:
As you can see, five of the kits match me exactly on this chromosome with over 50 cM. While that sounds like a lot, it's typical of only 4-5 generations back - in other words, it's 2nd-3rd great-grandparents (I think)! I've been in contact with the kit owner on FamilyTreeDNA and we think we match on the Hill family in Wiltshire, England. My third-great-grandmother is Rebecca Hill (1790-1862).
I wrote down one of the kit numbers above, and my own kit number, and went back to the first screen above, and clicked on the "One-on-one" comparison. That opened with this screen:
On the screen above, I entered the two kit numbers, checked the "Show graphic bar for each Chromsome?" Yes button, and clicked on the "Submit" button. The top of the resulting screen looked like this:
The green bars indicate a full match, the yellow bars a half match, the red bars are no match. There are other indicators. I'm not sure what all of that means...but I think that green bars are desirable and yellow pairs are good, but red pairs are bad.
Apparently, if I find a lot of green and yellow together on a chromosome, that means that there is a significant matching segment on that chromosome.
Further down the screen, I saw:
Look at Chromosome 15 - there is lots of green and yellow, all in a row! The small table above the color bar tells me that there is 54.4 centi-Morgans in that segment.
I can do a similar exercise on the X-chromosome results from the DNA Match table.
Now, I think what I want to do next is to make an Excel spreadsheet of the matching chromosome beginning and ending locations, along with the kit number, the person's name, email address, and number of generations, family tree location, and probable matching common ancestors.
There is a lot more on this website, and I'm still exploring it. I haven't looked at all of my matches, but I think I see at least one other genealogy blogger.
I know I've missed some of the website features also, and here, perhaps, my readers can help me out. What other features should I be using? Should I add a GEDCOM file? What should I put in my Excel spreadsheet? What other third-party websites should I be using? Please help me with links to other blog posts or articles about these analysis tools.
The URL for this post is: http://www.geneamusings.com/2014/08/my-first-look-at-gedmatch-autosomal-dna.html
Copyright (c ) 2014, Randall J. Seaver