Siblings graph (Family Tree DNA)
A PDF network graph of Family Tree DNA matches for any number of full siblings. The PDF chart is designed for onscreen viewing.
Also provided with each purchase is an enhanced version of the 'match' file, including matching groups and number of matches in common for each match.
Requires client-provided data files
The files required are 'Match', 'in-common-with' and 'chromosome' CSV files for each profile. These may be extracted using the DNAGedcom client. The DNAGedcom client is a small piece of software that can be used to download the data files for a modest subscription cost that can be cancelled at any time.
I do not offer downloads for Family Tree DNA files
About the Family Tree DNA charts
Family Tree DNA in-common-with data files do not have any sort of filtering applied. As a result there can be many distant cousin relationships included, which obscure the grouping of closer cousins. Simply filtering matches on the number of centimorgans shared does not tend to produce useful results.
Instead, I apply a two part threshold to the links between matches.
- All links with matches above a centimorgan threshold are included (the threshold used may vary from file to file).
- Below the threshold, only links where the shared DNA with each person overlap each other by a sufficient margin are included. This is not triangulation, but works as a reasonable proxy since true triangulation data is not available.
This hybrid approach provides good results, with clusters of matches identified and linked to closer matches.
All prices are in Australian dollars.