... by Ancestry's white papers and their transparency about their methodology. I wish FTDNA would do the same.
Parent and child comparisons at FTDNA can't be directly compared with those at AncestryDNA. Each company has different match thresholds:
https://isogg.org/wiki/Autosomal_
... additional capability. Now that DMT can be used for GedMatch results as well as FTDNA, DMT can provide the basis for determining all of the crossover points in a given set of matches for a person's chromosomes. I use both DMT and Steven Fox's Visual Programming spreadsheet, so this information is clearly valuable to me. Presently I will have to have both programs open ...
... My mathematical and statistical background makes me a big hater of inference. And the DNA industry seems to be getting deeper into that all the time. Soon a segment match won't mean anything at all. My reads of AncestryDNA's white papers leave me with little confidence in what they are doing. I've done the same parent-and-child comparison ...
... are widely shared in the ancestral population. We’ve seen this effect at AncestryDNA where, even with phasing, there are still a lot of false positives (or false negatives). See my blog post here:
https://cruwys.blogspot.co.uk/2017/08/comparing-parent-and-child-matches-at.html
This again is mostly a problem with smaller segments under 15 cMs. In my experience, ...
Thednageek (Leah):
Excellent questions, and thank you for them because you're making me really think. I'm hoping to use triangulations to incrementally build up a chromosome map of ancestors the way Jim Bartlett has done and describes on his segmentology.org blog. It is still a work in ...
thednageek: I think Ann beat you by a couple of minutes regarding 23andMe, so I had to give her credit for that update.
Re your 3rd possibility: Whether a segment is from a recent common ancestor or a distant common ancestor, it's still the same segment from the same ancestor that all the ...
... goal is really wanting the program to be able to figure out how some of these 7,000 DNA-relatives of mine are actually related to me.
I think ultimately, I can get the program to do it. Slowly getting there.
Louis
i know very little how these dna websites work. are testing sites and databases compatable with each other? is it possible to compare and match one's dna results with all the available databases? can dna results from other testing sites (ie. ...
Although, again, not directly relevant to DNA, there does seem to be a bit of reinventing the wheel on how to record complex 'transverse' relationships here.
My favourite is Mark Forkheim's system from over ten years ago...
http://www.forkheim.ca/family/num3.html
http://www.forkheim.ca/family/num2.html
... of this notation.
But my specific purpose for this notation is to identify the DNA relationship. For that, up and down don't matter. And the husband/wives don't matter either. Only the common ancestors do. With only 4 characters for people (X, Y, ? and -) plus parenthesis for the common ancestors, all the DNA statistics can be ...
Triangulation does NOT mean IBD - Blog comment by debbiek - 3 Oct 2017
Deep Ancestors - Blog comment by jbissett - 2 Oct 2017
Triangulation does NOT mean IBD - Blog comment by lkessler - 27 Sep 2017
Triangulation does NOT mean IBD - Blog comment by debbiek - 27 Sep 2017
Triangulation does NOT mean IBD - Blog comment by lkessler - 26 Sep 2017
Triangulation does NOT mean IBD - Blog comment by lkessler - 25 Sep 2017
Double Match Triangulator - Version 1.4 - Blog comment by lkessler - 22 Jan 2017
What to do When Your @FamilyTreeDNA Autosomal Results Come In - Blog comment by deckie49 - 14 Jan 2017
A New Notation for DNA Relationships?? - Blog comment by cp - 5 Jan 2016
A New Notation for DNA Relationships?? - Blog comment by lkessler - 24 Dec 2015