Andy, you and your chanel are my personal God! This is the most useful channel on the whole you tube! Once I visit the US, I will only do so to enroll you in a one-month genetic training course.

You did a good job here. Now that I understand cross matching I can see how some of gedmatches other tools work.

I have not yet used this tool. Now I know what I’ll be doing this weekend!

Excellent! Had the basic concept, but in a fuzzier format ;) Time to go use this tool!

Great illustration of cross matching.

"If you're new to Genealogy, chances are you have a ton of questions" yes

Great, thank you so much! Now I've got it. Another confusing point is - why clustering on GEDmatch sometimes gives results, rather inconsistent with triangulation results for the same kit

Sorry missed the live stream! Happy st patricks day!!

These videos are amazing! I do have a question after viewing the vid. In the middle of cataloguing my matches with largest triangulated segments, I've come across a peculiar case. I have more matches in-common with a likely distant cousin with whom I share just 8.1cM than with some of the people that I share 70cM or more. Not only that, but I was able to triangulate fully this one 8.1cM segment with 13% of the matches this distant cousin and I share. Yet many of our other matches do not share any segments on this "funky" chromosome. Could this be a case of false matches or endogamy?

This is going to seem like a stupid question, but while watching these videos I get an understanding of how to get the tools to work, but then I don't really understand how to follow through and work with the information. Please forgive me for that, you've probably explained it perfectly for 99.9% of people and I'm just that one person who then looks at the information, struggles to even print it so it's all on the sheet of paper, and then by the time I've done that I don't know what to do with the information next. I felt the same way with the On to Many tier 1 tool, MRCA search. I feel like GEDmatch is geared more towards the academics and isn't as easy to understand for those of us just beginning perhaps, or maybe I'm just slow.

Andy this was wonderful. Thanks for the in-depth tutorial! I tried it out on GEDMatch and I have a question. On the triangulation page it says they would show in green. Do those shown in red mean anything at all? I have a number of larger segments on a chromosome that would appear to triangulate but they are in red rather than green. I did check the crossmatching box if that helps.

Thanks for the clear explanation for this technique. It would seem likely that even at the 3rd cousin level, many people would be able to identify at least a surname indicating a common ancestor. What happens when you look at a kit that matches on a particular segment of a particular chromosome, but there's no common ancestor at 3, 4, or 5 generations? Maybe a more basic question is this: how much of "matching" in the algorithms is purely the commonality of all human autosomal DNA?

I am wondering if on a specific chromosome - can there be segments that match but belong to different ancestry? For example on chromosome 20, I have common segments for Irish ancestry with others but also a segment for Norwegian ancestry with a different group.

Hi Andy. My mom has 18cM overlaps on chromosome 16 with 50 people. Do you think there's a chance I'll find a common ancestor? Or is it a very small segment?

I discovered a whole other branch of Burnett’s not related to my paternal Burnett’s that are Irish. I sorted all the Burnetts into names and Scottish or Irish. I discovered a common ancestor from triangulation. And all the Burnett’s I sorted came up with a close relative but other with closer relatives but I know tbey are my moms Burnetts. Weird. Irish Burnetts only two. Have a ton. Of matches that are third cousins 40 cm. All Scottish Burnetts. Evertime I had a Burnett name they all traced back to Jeremiah Burnett and John and Lucretia. From Rappahanock Virginia 1600 to Sir Thomas Burnett of Scotland. Hundreds of us related because I had DNA done ten years ago. Figured it out the other day. Took awhile to sort name as it isn’t that common. Thanks

How do I use this using only Ancestry please?

My great grandfather has 1/2 siblings. I have found many cousins from decedent's from great grandfather's common father. If I go back another generation earlier, are these grandparents 1/2 grandparents? Or just the grandmother??

I have listened to this video several times and it does not cover this topic completely. I want to know what the colours mean when you triangulate segments with crossmatch... I know it is supposed to mean that the application finds different triangulation groups that match with the reference kit. For example, if I have a group of kits that are triangulated without crossmatch, the report will show them all in green, indicating common ancestry. If I then run the same report with crossmatch. I can get several TGs... sometimes I get some kits that come back coloured green (with no TG shown) and several more in different colours. If I understand it correctly, This means that the reference kit matches each of the kits in the TG who also all match each other. Each of the TGs shows in a different colour on the chromosome view and with a TG indicator in the kits view... except for the green ones that have no TG indicator. Do I have it right so far? Some questions: 1. why does crossmatch sometimes return a report with green (that do not seem to be in a TG) as well as others that are shown in a TG? 2. I have kits that I know are triangulated that are shown entirely in green when I run the report without crossmatch (as they should be) and come out in red when I run the same report with crossmatch? 3. why does the legend say that green indicates common ancestry when it appears to me that this is true of all TGs that are shown in different colours? I wish you had a tutorial on how to read the various reports and more detail on what they contain... it is not helpful to say "this is how you run report x"... and expect people to know how to interpret it. Thanks!

Unrelated: The Chinese calligraphy on the top right (the lady's side) is back to front. The side you are displaying is the back of the paper.

This guy should be told he has no teaching skills what so ever. He's awful !