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Louis Kessler (lkessler) Blog Comments

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Results 1 - 10 of 226 blog comments.   1091 blog entries.   218 forum posts.   1535 total.
1. 

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

Thanks, Debbie. I am now working with the help of your thoughts as well as those of Andrew Millard to try to statistically represent what Speed and Balding have simulated so as to better understand what their results represent. The constrained population is one thing (similar to a small version of Iceland over ...
2. 

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

Thank you Debbie for your analysis, but I'm still not convinced. You were correct on Facebook to say that the match filter would not affect results above 9 cM. So there must be some other reason why Speed and Balding give a greater than 20% chance that shared segments from 30 Mb to 40 Mb are from > 20 ...
3. 

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

Doug, (Professor Speed, Dr. Speed?) Thank you for your thorough response to my post. If I understand your explanation correctly, you are doing everything exactly the way it should be done. The one thing you don't mention is anything about filtering for only people who would show up in a person's DNA match ...
4. 

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

Jim, Thank you very much for your assessment. I too think that most of my segment matches (the ones that are valid) between 5 and 20 cM must be between 6 and 12 generations back since I have yet to identify any of them. But that's what endogamy with just a 5 generation genealogy does. I'm looking very ...
5. 

2016 and Looking Forward - Blog comment by lkessler - 16 Oct 2017

Hi Tony. I saw that something was done. But I don't see where the Extended Legacy Format document can be looked at. It is listed, but there is no link to it on the drafts page: http://tech.fhiso.org/drafts/
6. 

Deep Ancestors - Blog comment by lkessler - 4 Oct 2017

Joe, Sorry to take so long to respond. I hadn't seen Steven Fox's spreadsheet before. Couldn't find him or mention of his tool on Google. Finally, I discovered he was part of the Visual Phasing Facebook group. So I requested membership, and Blaine Bettinger, the group coordinator approved me. So finally I ...
7. 

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

Debbie: Well, I'm just looking at the results. And FamilyTreeDNA seems to have many fewer disprovals of IBD by parents at any given cM level than AncestryDNA does.
8. 

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

Very interesting, Debbie. So then it seems that FTDNA's criteria of at least one 9 cM segment is better (i.e. produces fewer false matches) than AncestryDNA's combination of phasing and inclusion of segments down to 6 cM. That may be indicative that AncestryDNA's phasing combined with its Timber may not be ...
9. 

Deep Ancestors - Blog comment by lkessler - 3 Oct 2017

Joe: I'm hoping to come up with a method of chromosome mapping using the match information and then display the map in the DMT output. If that is successful, then it will be an automated system that does what visual phasing does plus more (sometimes going back to generations further than grandparents). I think ...
10. 

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

Debbie: I agree with everything you say (except maybe one thing, which I'll likely write about in a future blog post). I was specifically talking about triangulation. Yes of course, a match between two people can be IBD. But the point of the article was to dispense with the notion that triangulation means ...