New GEDmatch Genesis Beta

 
 

 

GEDmatch Genesis

GEDmatch Genesis is a peek at things to come for GEDmatch. It provides two things:

    • Ability to accept uploads from testing companies with formats and SNP sets not compatible with the current main GEDmatch database.
  • A new comparison algorithm that we believe will provide better accuracy, and more flexibility. More info: The Genesis Algorithm

During this initial deployment, the GEDmatch Genesis database will be separate from the main GEDmatch database, and comparisons for one will not show entries made in the other. Eventually, the 2 databases will be merged, and results will include entries from both. Likewise, the benefits of the Genesis comparison algorithm will eventually become available to all GEDmatch users.

The initial offering of Genesis applications will be limited to autosomal DNA matches. That too will be expanded as we move forward in our effort to convert existing GEDmatch software to the new algorithm.

We hope you find this transition to GEDmatch Genesis useful.

 

 

 

The Genesis Algorithm

For several years, GEDmatch has provided genetic genealogists, both beginners and experts, the ability to search for matches among kits in their database without regard to vendor. Also, GEDmatch has provided a rich suite of analysis programs allowing users to dig deeply into the genetic details of their matches, enhance the reports from their vendors, and even pursue their own original research ideas. Our algorithms are evolving to extract the most trustworthy and meaningful matching information possible using the markers common to pairs of kits even though sometimes limited.

Unfortunately, all too often, kits appear to share a DNA segment purely by chance. To combat this confusing phenomenon, we recently have developed a reliability measure that allows users to assess the quality of a matching segment in an intuitively appealing fashion. We also use the measure to guide our matching algorithms as they wring the greatest amount of useful information possible from the markers common to pairs of kits.

If we could assume that marker characteristics were uniform in all regions within chromosomes, we could use a “one size fits all” requirement for matching segments as is sometimes done. Unfortunately, the relevant characteristics vary widely. Some long segments with few markers may be accidental matches. Some marker rich short segments are often discarded although they are profoundly non-random.

Using the characteristics of each and every marker in a segment, we compute the expected number of purely chance matches to it to be found in the database. That number is then used to classify the segment into one of several levels reflecting the likelihood that the random matches may overwhelm the real ones. When a user executes a one-to-many search or a one-to-one comparison specifying a minimum segment length, the display can then include an estimate of validity for each segment found.

One can assume those segments designated to be valid are the result of a DNA inheritance process rather than mere chance. Questions may still remain about how far back shared DNA originates, but a confounding factor has been removed.

sources:

https://genesis.gedmatch.com/select.php

https://genesis.gedmatch.com/Qblurb.html

 

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A Royal Family DNA Voyage 6 May 2018

A Royal Family Voyage

July 16, 2017

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DNA Tested African Descendants will be taking our 1st Family Reunion Cruise on 6 May 2018 departing from Orlando, Florida.  If you would like to join us as we meet and reconnect, please register. Bring the family with you!!  We are going to have lots of fun!

This is the first of many journeys that we will be taking.  It is ONLY just the beginning!  Keep DNA testing your family and finding more relatives.  

ALL Are Invited!  Bring your church, your greek, your Masonic, your organization, your family, and friends! All are welcome!

There are so many things to do on the ship that is a part of the cruise itself, it’s just amazing!

Additionally, we will also conduct the following:

African Naming Ceremony 

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Mini Genealogy, Gedmatch and DNA Class

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Ancestry.com Test Kit- Click on the image to purchase

23andMe DNA Test Kit – Click on image to purchase

Family Tree DNA Test Kit – click on image to purchase

Gedmatch Autosomal DNA Segment Analyzer (ADSA)

Autosomal DNA Segment Analyzer (ADSA)
GEDMATCH Quick Start Guide

ICW means In-Common-With were ever used

To use GEDMATCH with ADSA you must be a Tier 1 GEDMATCH member. That means you must have, at some time, donated at least $10 to GEDMATCH. The GEDMATCH upload process for DNAgedcom.com depends on two Tier 1 tools: Matching Segment Search and Triangulation which you cannot access unless you are a Tier 1 member. And, of course, you must have loaded your raw data to GEDMATCH previously so that it has been tokenized and batch processing is completed.

Some other things to be aware of:

  • Certain fields that are available for Family Tree DNA kits are not presently available for GEDMATCH. These include:

    Match Date

    Predicted Relationship

    Known Relationship

    Relationship Range

    Haplogroups

    Surnames

    Total Shared cM

    Longest Block cM

    So, this means that using these for sorting, selection, highlighting or display purposes may not have the results you wanted because these fields are empty in a GEDMATCH kit.

  • To manage processing load on GEDMATCH’s servers, only the In-Common-With (ICW) indicators for your top 400 matches are provided by GEDMATCH, so you will only have ICW bricks in the ADSA report for your longer segments. You can manually determine ICWs for other matches by doing a one-to-many report for one of your matches and comparing their list of matches to yours.

  • Generally, there are a lot more segments in a GEDMATCH ADSA report than for Family Tree DNA. This tends to slow down the responsiveness of your browser when viewing the ADSA report. You may wish to increase the minimum segment size in ADSA to 10 cM(Centimorgans)

  • The GEDMATCH tools that are used to gather the data for DNAgedcom exclude very close relatives (eg. siblings, parents, children) to improve processing performance, so you will not see them as matches on your ADSA report for GEDMATCH kits.

  • The X chromosome matches are not presently included in GEDMATCH kits.

To get started, follow these steps.

  1. If you haven’t already done so, go to www.DNAgedcom.com and click on “Register”:

  2. Register for a free account at DNAgedcom.com:

  3. Logon to DNAgedcom.com with your new username and password:

  4. Prepare to upload your GEDMATCH data to DNAgedcom.com:

    You will see a screen with a large, square text input box. Do not enter anything here yet.

  5. Leaving the window above open, create a new browser window or tab and go to the www.gedmatch.com and

    logon

    . Click on “Matching Segment Search” in the Tier 1 tools menu near the bottom of the screen:

  6. Enter your kit number and click “No” on the graphic bar (very important!) and click “Submit”:

  7. Now wait for the report to finish – it will probably take a few minutes. When it is complete it will look something like this:

    Select everything on the screen and copy it to the clipboard. In

    Windows

    you can do this using

    ctrl-a

    followed by ctrl-c. On a

    Mac

    you can use command-a and command-c. You may have to wait a little while for the copy to complete. There is a lot of data there to copy. (If you don’t wait long enough, when you paste the information into DNAgedcom you won’t get what you copied. You may see a

    hour-glass

    or spinning beach-ball while the copying is going on.

    Usually

    the copy process doesn’t take more than a minute or two.)

  8. Go to the browser window you have open to DNAgedcom.com. Click

    in

    the square box and paste what you copied into it. On

    Windows

    you can use Ctrl-v or you can use command-v on a Mac.You should see a portion of what you copied like this:

    Click the “Load” button. The load should complete in a few seconds.

  9. Click the Clear button to erase the text-input box again and return to your GEDMATCH browser window. Return to the main GEDMATCH menu again.

  10. Now click on the Triangulation tool.

  11. Enter your GEDMATCH kit number and select the middle radio button (very important!) and click on the “Triangulate” button:

  12. Wait for the report to complete. The Triangulation report may take longer than the Matching Segment Report depending on how many In-Common-With matches you have and the current load on GEDMATCH’s servers. When it finishes there will be 4 rows of asterisks on the screen and the screen will look something like this:

    Once again, select the entire page (ctrl-a or command-a) and copy it to the clipboard (ctrl-c or command-c). Wait for the copy to complete. Then switch back to your DNAgedcom browser window.

  13. Make sure the text-input box in DNAgedcom is empty (use the Clear button if you need to) and then paste the Triangulation report into the box with ctrl-v or command-v. Then click on the Load button.

  14. When the Load process completes the screen will refresh. You can now go to ADSA by selecting the Autosomal Tools menu and the Autosomal DNA Segment Analyzer option on that menu. Or you can go to this link: http://www.dnagedcom.com/adsa. You will see a screen like this:

  15. Select your kit from the drop-down menu. GEDMATCH kits will start with a letter (A=Ancestry, F=FTDNA, M=23andMe etc.):

  16. Click GET REPORT

  17. If you have Ashkenazi ancestry or are part of an endogamous (interrelated) group you may not be able to generate a report with the default input parameters. Please consult the Tips for People with Ashkenazi Ancestry page before clicking GET REPORT.

For more information about this process, how to interpret your results, or troubleshooting, read the full ADSA manual.

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