Wow! This is a wonderful addition to our bag of tools. Start with the ICW list for one person, choose five at a time, and a few clicks later you have all your trtiangulated matches with the starting person. See https://dna-explained.com/2017/10/21/introducing-the-triangulator/.

Not to spoil the party but how is this tool going to identify the third side of the triangle? If you (A) match B and C, how does the tool tell you where exactly (which chromosome, start and end position) B is matching C? This would be triangulation, to my knowledge and past unsuccessful tries with the FTDNA website this information isn’t revealed at all to person A (due to privacy concerns, as A could identify medical predispositions for B and/or C). If Roberta is on this list, could you explain, please? As the original post is from here. Or anyone else? Otherwise this isn’t a triangulation tool, it’s only identifying two sides of the three that a triangle needs (hence its ICW - in common with, which doesn’t mean that B and C triangulate on the same locus). Though I’d welcome it if FTDNA would finally give us access to the third missing triangle side! It’s not the tools, it’s what information is being accessible. Regards, Andreas > On 23 Oct 2017, at 16:07, Doris Wheeler <[email protected]> wrote: > > Wow! This is a wonderful addition to our bag of tools. Start with the ICW > list for one person, choose five at a time, and a few clicks later you have > all your trtiangulated matches with the starting person. See > https://dna-explained.com/2017/10/21/introducing-the-triangulator/.

As I have pointed out several times, if you take two of your Matches with overlapping shared segments, AND one Match is in the ICW of the other, this is equivalent to Triangulation over 95% of the time. I don’t know how much over 95% as I found one or two that met that criteria but didn’t pass Triangulation when other data (usually GEDmatch) was found. Multiple shared segments are sometimes tricky. However, with single segments over a higher threshold, it would work virtually all of the time. The principle here is that every shared segment has to be IBD or not-IBD. Those that are IBD must be on your maternal chromosome or the paternal chromosome. With a threshold over say 10cM, coupled with being on multiple ICW lists, virtually all shared segments will be IBD. The ICW lists will then group them correctly, virtually always. This is a grouping exercise. I’ve tried this new tool on various parts of my spreadsheet, and it appears to work. In my sample, I found one segment below 10cM that I had Triangulated, which wasn’t included in the TG - primarily because such a small segment only overlaps enough with maybe one or two others. The process is however tedious, owing largely to the slow/clunky nature of FTDNA’s search function. If your Match is John Jones, with 3 spaces between the names, it may take a while to find him... Now, if we could just turn it on at night and wake up with all TGs formed.... Jim Bartlett - atDNA blog: www.segmentology.org > On Oct 24, 2017, at 5:34 AM, Andreas West <[email protected]> wrote: > > Not to spoil the party but how is this tool going to identify the third side of the triangle? > > If you (A) match B and C, how does the tool tell you where exactly (which chromosome, start and end position) B is matching C? > > This would be triangulation, to my knowledge and past unsuccessful tries with the FTDNA website this information isn’t revealed at all to person A (due to privacy concerns, as A could identify medical predispositions for B and/or C). > > If Roberta is on this list, could you explain, please? As the original post is from here. > > Or anyone else? > > Otherwise this isn’t a triangulation tool, it’s only identifying two sides of the three that a triangle needs (hence its ICW - in common with, which doesn’t mean that B and C triangulate on the same locus). > > Though I’d welcome it if FTDNA would finally give us access to the third missing triangle side! It’s not the tools, it’s what information is being accessible. > > > Regards, > > Andreas > >> On 23 Oct 2017, at 16:07, Doris Wheeler <[email protected]> wrote: >> >> Wow! This is a wonderful addition to our bag of tools. Start with the ICW >> list for one person, choose five at a time, and a few clicks later you have >> all your trtiangulated matches with the starting person. See >> https://dna-explained.com/2017/10/21/introducing-the-triangulator/. > > > > ------------------------------- > To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message