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Louis Kessler's Behold Blog     The Behold User Forum

debbiek (debbiek) Comments and Posts

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Results 1 - 6 of 6 total.   6 blog comments.   0 forum posts.
1. 

Revisiting Speed and Balding - Blog comment by debbiek - 9 Nov 2017

If you have a stable population over 50 generations then you do get extreme pedigree collapse. This is pretty much what has happened throughout human history with the exception of the last 300 years: https://en.wikipedia.org/wiki/World_population_estimates All humans are highly endogamous. It's just a question ...
2. 

Revisiting Speed and Balding - Blog comment by debbiek - 8 Nov 2017

Can I also suggest that people have a read of the comments in the ISOGG group on Facebook in the discussion about this blog post. https://www.facebook.com/groups/isogg/permalink/10156092253692922/ In particular I recommend reading the comments from Dr Andrew Millard from the University of Durham. He has ...
3. 

Revisiting Speed and Balding - Blog comment by debbiek - 8 Nov 2017

Louis It makes no difference whether one is studying diseases or detecting DNA relatives. It's still necessary to identify related people in the database. The reason the testing companies filter small segments under 6 cMs or 7 cMs is not to exclude small segments from distant generations but for the very ...
4. 

Triangulation does NOT mean IBD - Blog comment by debbiek - 4 Oct 2017

No I think it means the opposite. FTDNA can't use a higher threshold because they are not using phasing or any algorithms to remove pile-ups. The vast majority of matches that don't match either parent at AncestryDNA share under 9 cMs. Ancestry's own tests published in their white paper show that we would ...
5. 

Triangulation does NOT mean IBD - Blog comment by debbiek - 3 Oct 2017

Louis, I shall look forward to your future blog post. Inference is a popular word in population genetics and genetic genealogy. Unlike mathematics, we can't have complete certainty. It's therefore a question of testing hypotheses and quantifying the uncertainty. I've actually been very impressed by ...
6. 

Triangulation does NOT mean IBD - Blog comment by debbiek - 27 Sep 2017

I presume you are using triangulation here to mean that three people match on the same segment and that close relatives (eg, parents) cannot be included in the triangulation as they are on the same leg of the triangle as you. If so, it is not true to say that three people have to match on a segment for it to be ...