{"id":8428,"date":"2018-12-06T01:23:37","date_gmt":"2018-12-06T01:23:37","guid":{"rendered":"http:\/\/www.jmhartley.com\/HBlog\/?p=8428"},"modified":"2018-12-06T01:25:24","modified_gmt":"2018-12-06T01:25:24","slug":"autoclustering-my-23andme-matches-and-more-ftdna","status":"publish","type":"post","link":"http:\/\/www.jmhartley.com\/HBlog\/2018\/12\/06\/autoclustering-my-23andme-matches-and-more-ftdna\/","title":{"rendered":"AutoClustering My 23andMe Matches and More FTDNA"},"content":{"rendered":"

In my previous Blog, I looked at AutoClustering my AncestryDNA and FTDNA matches<\/a>. In this Blog, I’ll look at 23andMe. I have to confess, that I have never had a good feel at working the DNA matches at 23andMe. I was hoping that AutoCluster would give me a boost in figuring out what I have there.<\/p>\n

Here is my AutoCluster at 23andMe:<\/p>\n

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Now I am up to 45 Clusters. I used a slightly lower threshold than I used at FTDNA, and got different results (20 cM at 23andMe vs. 25 cM at FTDNA). At FTDNA, the first two clusters had 108 members and Cluster 2 had 10 members. At 23andMe, the first two Clusters are a bit more even at 66 and 65 members. Also I note that the green Cluster 2 is quite closely related. All 65 members match each other.<\/p>\n

Identifying the 23andME Clusters<\/h2>\n

My first thought is to figure out what these clusters represent. Which line is which? I do have a few known cousins at 23andMe.<\/p>\n

Cluster 8: The Lentz\/Nicholson Line<\/h3>\n

My mom has a cousin Judith who is on the Lentz Line. She is on Cluster\u00a0 8.<\/p>\n

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Judith also descends from the Nicholson family as does at least one other person in Cluster 8.<\/p>\n

My Cousin Jennifer: Hartley Side<\/h3>\n

Another point of reference is Jennifer who is my 2nd cousin, once removed.<\/p>\n

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This corresponds with my Hartley’s at AncestryDNA:<\/p>\n

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Steve with Clarke Ancestry<\/h3>\n

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I’ve blogged about Steve who is a 23andMe match. He has Clarke ancestry and is in Cluster 19:<\/p>\n

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Cluster 19 is quite a ways down on the list.<\/p>\n

Cluster 2 and Chromosome 20<\/h2>\n

I have written a few Blogs on my Chromosome 20. I have many matches there on my Frazer grandmother’s Irish side. These Chromosome 20 matches appear to correspond with my Cluster 2.\u00a0Here is one Blog I wrote on my Chromoosme 20 about 2-1\/2 years ago<\/a>. In that Blog, I reasoned that the matches may be on my McMaster side:<\/p>\n

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In my previous request for an AutoCluster at FTDNA, I had set the lower threshold at 25 cM and that had filtered out a lot of the Frazer side matches. At 23andMe, I lowered the threshold to 20 cM which would explain the larger cluster.<\/p>\n

Deciphering FTDNA Cluster 1<\/h2>\n

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If FTDNA is like Ancestry and 23andMe, then the yellow Cluster should be a Hartley Cluster. First I checked the top match. It turns out that FTDNA over-reports these matches:<\/p>\n

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Roger shows a match of 67.3 cM with me, but his top segment is 12.3. Here is what the FTDNA Browser shows:<\/p>\n

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The browser shows one small match at Chromosome 20. This is where I have a lot of Frazer matches as described above. Theresa is also in FTDNA Cluster 1:<\/p>\n

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Thesesa also has a relatively small match corresponding with her 13.1 cM largest segment on Chromosome 20. That means that even though I tried to avoid my Chromosome 20 overmatching problem by raising the cM threshold to 25 cM, FTDNA managed to add in tiny cM’s and up the totals for these matches.<\/p>\n

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It is unfortunate that FTDNA has small matches that come out as large. I don’t know if this is as big a problem for others as it is for me. Basically I have a large group of distant relatives that I can’t connect with in Cluster 1.<\/p>\n

A Comparative View: Three Companies<\/h2>\n

Here is a comparison of the three AutoCluster runs I have done with three companies. A better comparison would be for me to rerun the Ancestry results with a lower threshold:<\/p>\n

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