How is phasing done without using parent/child or other close relatives? I understand the Ancestry does this or attempts to do it, but how? How does the program or procedure do the phasing and how accurate can it or could it be? Barbara ----- Original Message ----- From: "Tim Janzen" <tjanzen@comcast.net> > ...We need to move to > phased data for these types of comparisons in the future. Hopefully > 23andMe > and FTDNA will eventually provide that for us. Hopefully Ancestry.com > will > eventually provide us with the HIR data and will improve the quality of > their phased data.... \

Barbara As I understand it, they look at your DNA data in general and select some other persons data (called a reference sample) who might be a stand in for your parents and phase your data. The theory, as I get it, is that this pseudo-phasing is better than nothing and helps segregate out some IBS matches. I've looked at a lot of Ancestry matches who have uploaded to GEDmatch and match me there. I've tried to Triangulate them when several fall on overlapping segments - both among the Ancestry kits, and with kits from the other companies. Although a few do Triangulate (indicating IBD segments); a lot do not. Many (most) of my Ancestry matches at GEDmatch are in the bottom third of my list of matches there, with small segments which usually turn out to be IBS - I quit using them - even with Jeff's tool, I was usually unsuccessful in finding the Ancestry kits at GEDmatch who matched me, back on my Ancestry list. To say the least - I was not impressed with what they called phasing. Others may have a different view. Jim - Sent from my iPhone - FaceTime! On Nov 20, 2013, at 10:56 PM, "karenhappuch" <karenhappuch@cox.net> wrote: > How is phasing done without using parent/child or other close relatives? I > understand the Ancestry does this or attempts to do it, but how? How does > the program or procedure do the phasing and how accurate can it or could it > be? > Barbara > > ----- Original Message ----- > From: "Tim Janzen" <tjanzen@comcast.net> >> ...We need to move to >> phased data for these types of comparisons in the future. Hopefully >> 23andMe >> and FTDNA will eventually provide that for us. Hopefully Ancestry.com >> will >> eventually provide us with the HIR data and will improve the quality of >> their phased data....