Using the tools at GEDmatch
the Basics for Finding Relatives

a free third party site for DNA test comparisons and more

by Kitty Cooper, blogging at blog.kittycooper.com

The video of me talking about GEDmatch tools using these slides will be available as of Dec. 9 from http://i4gg.org/

This talk did not cover ancestry composition (aka admix), my slides on that are http://slides.com/kittycooper/gedmatch#/

I also have many blog posts about GEDmatch, see http://blog.kittycooper.com/tag/gedmatch/

This slide originally had a link to the slides site - slides.com/kittymcooper

Basic Home Page at GEDmatch

Basic Home Page at GEDmatch

While you wait for your kit to "tokenize" so you can use the ONE TO MANY tool

Run these two tools

23andme File Analysis

Family Tree DNA File Analysis

DNA File Diagnostic Utility Output

Family Tree DNA File Analysis

DNA File Diagnostic Utility Output

Run this tool next

Basic Home Page at GEDmatch

Please upload a GEDCOM with about 10 generations of ancestors for each kit

The most important tool for finding relatives is the one to many

One to Many Comparison

My Dad's One to Many Report

• Clicking the L gives you the one to many for that kit, your match

• Kit numbers: A ancestry, M 23andme, T family tree DNA, Z new generic

DNA excerpt from Dad's One to Many Report

One to one with numbers and graphics (partial page)
My double third AJ cousin

One to one without the graphics
My double third AJ cousin

Siblings have fully identical regions (FIRs) - the green bars

You can select a group of kits to investigate from the one to many

• The color coding is the size range in cMs (the graph is in base pairs).

The GEDmatch 2-D Chromosome Browser

• Each person is a different line rather than a different color

• Old branch means that it is an overlap (not necessarily a match) to a previous person, a white line connects to that person

The 3D chromosome browser charts

The other tools are

• Tracebility

• Matching GEDCOMs

• X matrix

• The Segment CSV

Traceability gives you a picture of who matches who

Traceability Close Up

Matching GEDCOMs shows you which matches have trees

The Segment CSV file gives you the actual chromosomes and matches

The ICW function:


"People who match
one or both kits"

Comparing my Dad and my 2nd cousin with threshold 8cM

My GEDmatch home page has the tier 1 utilities

A paid membership gets some extra tools called "Tier 1"

Form to do a matching segment search, enter your kit number

Part of a Matching Segment Report

All the information needed for a Master Spreadsheet is in the Matching Segment Report

http://blog.kittycooper.com/2016/09/taking-it-to-the-next-level-dna-spreadsheets/

Form to do a triangulation, enter your kit number

Sorted by Chromosome and Position with Graph

Sorted by Kit Number has more information and can be resorted in a spreadsheet

Extract from the Master Spreadsheet that I use for my Dad's comparisons

I put the triangulation information in the notes column and color the TGs

Relationship shared DNA at ISOGG wiki from Blaine Bettinger

Blaine Bettinger's chart from the ISOGG wiki entry on autosomal statistics, bookmark it and use it!

Phasing

• If you have at least one parent tested then you can separate what you got from each parent
  
  
• For child kit number 'xxxx', paternal file will be generated as PxxxxP1 and maternal file will be PxxxxM1
  
  
• If the maternal or paternal phase can be determined the values will be assigned else the original unphased values will be kept
  
  

Questions?