Still a draft. Please add to this if you can. Thanks!
What is GEDMatch?
GEDmatch.com helps find shared ancestry between persons who have uploaded their autosomal DNA (atDNA) results from 23andMe, AncestryDNA, or Family Tree DNA's Family Finder.
"'One-to-many' matches" and "Find people who match you on a specified segment" are the analysis tools which are helpful for finding shared ancestry.
One-to-many matches show how well you match other people in the DNA database that is collected by GEDMatch. To analyze this, GEDMatch needs several weeks.
A one-to-one match shows how well your autosomal data matches with another kit stored at GEDMatch. This can be utilized right after the kit has been tokenized (registered properly in the database).
Refining your relationship results
GEDMatch can help you to reduce the number of potential common ancestors when you learn about new cousins.
When you enter the kit number of your father, your mother, and the potential cousin in the "3D Chromosome Browser" you can rule out either your mother's or your father's family as the link.
With phasing you can extract maternal or paternal data by comparing a child's DNA with DNA with one of the parents. This can be used after tokenization for "one-to-one" or "3D Chromosome Browser" comparisons.
Bear in mind that the data is only 50% of the tested data.
GEDMatch reveals the submitter's e-mail address and the admixture tools infer the ethnic admixture of the person tested.
Usage on WikiTree
When you enter or edit an autosomal DNA test, the optional field for GEDMatch ID will appear.
It should look something like this: M121714 or A675090 or F008867.
We want to be able to link to a page on GEDMatch, but currently you have to login to GEDMatch to use it. So it doesn't appear possible to link to a GEDMatch page. See G2G posting on how GEDMatch ids could be used to find ancestry.
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This page was last modified 15:16, 5 March 2015. This page has been accessed 15,680 times.