Advanced Tools at GEDmatch: Using Segment Data and more
All my slides are always online at

The new home page has much help for new users plus messages about what's new on GEDmatch









GEDmatch is still the best place to compare your kit to DNA tests from other companies
example of the one to many comparison

Why is GEDmatch is still the best place to compare your kit to DNA tests from Ancestry or relatives tested at different companies?
- MyHeritage does not show the X
- Family Tree DNA does not show comparisons of third parties to each other nor triangulations
- Neither shows fully identical regions (FIRs)
- and there are way more segment level tools at GEDmatch
Some of the FREE tools that I find invaluable are highlighted

Be sure to always check that your newly uploaded kit has uploaded correctly



When uploading a new kit be sure to check if the parents are related, if they are this can make it harder to figure things out

There is a now a relationship calculator

The free version of the One to Many shows the testing company and how many SNPs are in common between the kits
The column headings are explained in this post
https://blog.kittycooper.com/2019/02/genesis-basics-gedmatch-reinvented-part-1/

Close up: note the testing company and how many SNPs are in common between the kits and mitoYDNA has been linked to a haplogroup

Click the largest segment under autosomal to get the one to one comparison for that match, same for X
How to get the image only?
Check graphic only on the form


If you and a DNA relative are both tested at Ancestry, you can upload to GEDmatch to see the actual segment data

Viewed as an image, the HIRs (half identical regions) show as blue bars and the FIRs (fully identical regions) show as green bars
Why is this useful? Well to have fully identical regions with a relative you need to be related on both your mother's and father's sides. Full siblings, 3/4 siblings, double first cousins

See explanation at blog.kittycooper.com/2019/10/why-dont-we-share-more-dna-with-a-sibling/
3/4 siblings HIRs + FIRs = theoretically about 2500
example known 3/4 siblings: 2267.7 + 533.8 = 2801.5


Most comparisons will have only blue bars and no green bars of any significant length

Another option on the one to one form is to show only the FIRs? doubly related people like full siblings, 3/4 sibs, double first cousins will all have these
Normal one-to-one image chr 1-8


For why only FIRs are useful see blog.kittycooper.com/2019/10/why-dont-we-share-more-dna-with-a-sibling/
At the bottom of the image comparison are the numbers


The X is often important for figuring out relationships.
Sisters who share a Dad will share a full X, see
http://blog.kittycooper.com/2014/03/how-can-the-x-chromosome-help-with-maternal-versus-paternal/

Two HALF sisters

Two full sisters
The X chromosome is a separate comparison
Note that here we are getting both numbers and image


Be sure to check the Prevent Hard Breaks on the X form
Tag groups make the one to many more useful, see

To see your tag groups check either One or All in Tag Groups

The one to many with tag groups for a close cousin tells me quickly how they are related

To set up or edit your tag groups click on the
VIEW/EDIT next to your profile summary

The next page has a set of tabbed headings; click on Tag Group Management

Give the group a name in description and a color by selecting one from the color chart

The shared option is not yet implemented but you can transfer the group to another account

People who match both kits, or 1 of 2 kits

Some of the Tier 1 (so PAID) tools that I find invaluable are highlighted

Combine multiple kits into 1 superkit
you can make a kit which combines all your test results from different companies


More about this tool at
https://blog.kittycooper.com/2020/07/tool-to-find-common-ancestors-at-gedmatch/
Find common ancestors in the trees of your DNA matches - here are my results

Click on PTH to see the below, the 3G or whatever G shows the descent for that one person from the common ancestor


In Tier 1 you can check the checkboxes from the one to many or kits that match 2 kits and then click on visualiztion oprions to get to the MULTI KIT ANALYSIS





You can do a matching segment search for just the selected kits
Even better is a triangulation for just the selected kits




My Compact Chromosome Browser



Autosomal Matrix

The 3D chromosome browser includes multiple matrices, autosomal. X, and number of segments

Tier 1 members have a more accurate One to One for checking on the validity of small segments

A normal one to one
My and my double 3rd cousin, shared Jewish ancestral couple


The Q matching One to One

Q pile ups: My aunt and my new 3rd cousin
SNP density: My other aunt and my new 3rd cousin


Recently a Norwegian DNA match to Dad with a deep family tree found that he is my 12th cousin twice removed
His single segment match to my Dad and my brother is in a pile up area with about 100 or so matches on the various sites
Actually GENI figured it out for us.
So now I wonder if those many other matches on this 12cM pile up area are also descended from this ancestor

Could I investigate using thegranularity on
Segment Searches (Tier 1) ?

OOPs, I see cousins on both Dad's paternal and maternal side. How might I ensure that those overlapping segments triangulate?


This way found 64 segments. My brother has this same pile up ....

A phased kit of the DNA my brother got from my father can be used!



Much better, only 54 and only his maternal cousins now
The GEDcom tools were the first apps on GEDmatch before autosomal DNA, they are still useful


Basic clustering has changed a little, older version here:
https://blog.kittycooper.com/2019/05/more-clustering-tools/
but the new tools include some new clustering from Genetic Affairs!
Can software figure out the family tree from the shared DNA?
AUTO Kinship
The result has to be downloaded

After you download it and unzip it click on the folder Autokinship then on the HTML file autokinship to see a long page in your browser: first the clusters

My auto kinship clusters
one endogamous population grandparent, and another missing from the testing community

Since so many of my MUNSON cousins are tested ... what would autokinship came up with for that cluster 2 green box?

Lauritz + Josephine Monsen
Inga
Lawrence
Alfred
Christian
Pretty accurate. I have identified which child of my great great grandparents each match is descended from. Only the last one is not, he is actually descended from a sister of Josephine's
?
A closer look at my cousins with the one generational correction


?

Next is a matrix of how many cM they each share with each other

And finally there is a list of shared segments that met your criteria
Tim Janzen did a great Rootstech talk about these new features at

Shall we look at the auto tree for my endogamous cluster?

Here are the few trees created for cluster1 - the problem is not enough kits have linked trees on GEDmatch

Gugenheimer and Thannhauser are known ancestral lines, not Shadur
Can this
autokinship tool
help in unknown parentage cases?
MAYBE

Advanced Tools at GEDmatch: Using Segment Data and more
By Kitty Cooper
Advanced Tools at GEDmatch: Using Segment Data and more
What is new at GEDmatch and why it is still indispensable for the serious genetic genealogist
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