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Weekly Information Technology/Engineering Update (10 Dec 2013)

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  • Weekly Information Technology/Engineering Update (10 Dec 2013)

    Matches Maps Locations Clear Button

    Some users have requested the ability to clear their stored map coordinates for their most distant known maternal or paternal ancestors. We have added a Remove Location button to Step 3 of the Update Most Distant Ancestor’s Location wizard.



    Family Tree DNA myFTDNA BETA Family Finder – Matrix

    Today, we are happy to release our new BETA Family Finder – Matrix page. The Matrix tool can tell you if two or more of your matches match each other. This is most useful when you discover matches with wholly or partly overlapping DNA segments on the Family Finder - Chromosome Browser page.

    Due to privacy concerns, the suggested relationship of your two matches (if related) is not revealed. However, we can tell you whether they are related according to our Family Finder program. To use it, you select up to 10 names from the Match list on the left side of the page and add them to the Selected Matches list on the right side of the page. A grid will populate below the lists. It will indicate whether there is a match (a blue check mark) or there is not a match (an empty white tile).

    You access the BETA Family Finder – Matrix page through the Family Finder menu in your myFTDNA account.

    The page starts out with two list areas: Matches and Selected Matches. You add Matches to the Selected Matches list by clicking on a name and then on the Add button.



    Here is a screenshot of the BETA Family Finder – Matches page with a few matches added to the Selected Matches list.



    You add matches by clicking on a name on the Match list and then the Add button.



    You can change the order of names in the matrix by clicking on a name and then either the Move Up or the Move Down button.



    To remove someone from the Selected Matches list, click on their name and then the Remove button.


  • #2
    comment

    but no way to view to tell if they are matching on the same segment as the match to yourself like at 23andMe? Or am I missing it? I've found many a match who match one another but at different chr/seg locations so not true group matches indicating a common ancestor as the source of a shared DNA segment. Thx! Maybe moving in the right direction though.

    Comment


    • #3
      Privacy Policy

      Originally posted by Zephyr View Post
      but no way to view to tell if they are matching on the same segment as the match to yourself like at 23andMe? Or am I missing it? I've found many a match who match one another but at different chr/seg locations so not true group matches indicating a common ancestor as the source of a shared DNA segment. Thx! Maybe moving in the right direction though.
      Hello,

      That may be coming in 2014. We need to work through how to handle the privacy issue. I know from my kits there that 23andMe requires both accepted contact and then basic genome sharing for each match. We would have to do something similar for at least a secondary sharing consent. That needs to be approached carefully so that individuals are respected but as many people as possible opt-in.

      Comment


      • #4
        Neat. A nice step forward.

        It would be slick if, in the matches list in FF, using the "in common with" tool, that when used and seeing a list of names that one could click a button and have a Matrix automatically generated from that list of "in common" people.

        It would also be nice if we could select the criteria to qualify as a "match" in the matrix, such as minimum segment size.

        Comment


        • #5
          It looks like a good working tool. I have been doing things like this by hand, and this is much quicker.

          Right now there is no way I see to save a matrix, other than printing. I think the matrix is a guide to research and would love to be able to download it to a spread sheet. The spreadsheet might have the total shared or longest segment shared in the check box. I think I would like the two numbers better than the guess at relationship. I guess I do not feel there is a privacy concern here, but even a distant, closer, close, very close, code would be helpful. Or also/even a code that indicates if the two have agreed upon a known relationship, even if we can't know what that is.

          I would also love the option to put matches in common into the matrix with a keystroke. That is what I have been doing this afternoon and scooting them around to get a perfect triangle.

          And if we had the option of downloading and saving a list, it would be cool to be able to upload it and resume moving and adding.

          Comment


          • #6
            Originally posted by Rebekah Canada View Post
            Hello,

            That needs to be approached carefully so that individuals are respected but as many people as possible opt-in.
            Having the default be opt-in and providing an opt-out achieves that.

            Comment


            • #7
              This is really a new feature but connected to the matrix. It would be very useful if two known relatives, who do not match by the algorithm in use, could submit something that said "Include us in each others matches". This would let us look at matches in common more easily.

              A current example is a 5th cousin who lives in another country. She does not match me or 3 other of her 5th cousins by the algorithm. But two of us match some of her matches, and there is pretty good evidence we are looking back 2-3 generations past our common ancestor, matching 7th or 8th cousins in that other country. Those matches have great paper genealogies and we have a fair chance of learning the connection. But every time we get new matches we have to go through a 5 person dance to exchange the new matches and look for duplicates.

              Comment


              • #8
                Regarding chromosome browser:

                Currently, I can select a match & see which segments are shared. This is apparently not considered a privacy issue.

                I can also select two people from my list of matches & see which segments are shared with the reference (me). Again, not apparently a privacy issue.

                I don't see why it would suddenly become a privacy issue if I got a report of identical segments shared by all three: the reference & each of the two matches. If this presents some sort of privacy problem, I think that this problem exists in the first two cases as well.

                Timothy Peterman

                Comment


                • #9
                  Originally posted by T E Peterman View Post
                  Regarding chromosome browser:

                  Currently, I can select a match & see which segments are shared. This is apparently not considered a privacy issue.

                  I can also select two people from my list of matches & see which segments are shared with the reference (me). Again, not apparently a privacy issue.

                  I don't see why it would suddenly become a privacy issue if I got a report of identical segments shared by all three: the reference & each of the two matches. If this presents some sort of privacy problem, I think that this problem exists in the first two cases as well.

                  Timothy Peterman
                  The segment browser shows you where you are half identical with another person. From this you can conclude what the sharer's allele is at any location within that segment only if you are homozygous at that location.

                  However, if you could exchange enough data with enough shares, and some of them gave you their raw file, you could write an algorithm that could estimate to a high confidence what all the data is for those who didn't give you their raw files.

                  I think the concern over privacy is overblown, but I accept that FTDNA has to deal with it.

                  Comment


                  • #10
                    The matrix tool looks like a very usefull tool but i think it can be further improved. Here are my suggestions:
                    1. Total shared cM metween matches could be great
                    2. Allow threshold for the matrix
                    3. Min cut of the Adjcency martix would be ausome
                    4. Min cut of the Adjcency martix would be ausome
                    5. Compare specific segments

                    Comment


                    • #11
                      Originally posted by Zephyr View Post
                      but no way to view to tell if they are matching on the same segment as the match to yourself like at 23andMe? ... I've found many a match who match one another but at different chr/seg locations so not true group matches indicating a common ancestor as the source of a shared DNA segment...
                      I agree with Zephyr. This is a step in the right direction, but short of the chromosomal level of matching detail needed. Nice, but this is essentially the same matrix (sans detail) found on the GAP pages. The only difference is that one can now see this with respect to an individual account's POV.

                      I use the GAP matrix from time to time, in projects that have encouraged atDNA participants. This form of matrix is useful, but not definitive for a drill down study.

                      For instance, I have done a recent detailed study of a multiple triangulated match on Chr 4 which has now grown to 14 people, all of whom are related to the same ancestral couple at about the fourth cousin level. One of those in the study, however, matches me on another segment on another chromosome which 13 of the others do not.

                      If I were using the matrix as currently configured at the beginning of this study, I would have extra people intermingled into the Chr 4 group, who were not legitimately connected to that group through the same common ancestors.

                      Good try FTDNA but you are not there yet in terms of the detail of individual blocks on individual chromosomes we need to show that three (or more) people all match one another, i.e., A=B=C for a specific block.

                      Comment


                      • #12
                        I finally just got around to playing with this new feature. I like it. It is easy to use. I too would like to see more of where we all exactly share or don't like at 23andme. Sometimes I can see where my Mom shares with say two matches over there. Then you can see if those two matches are sharing even more on another chromosome. Thanks FTDNA keep the new autosomal tools coming!

                        Comment


                        • #13
                          One small request would be a clear button to remove "all". If I build matrix and then want to work on another grouping, I need to exit and re-enter to clear the slate.

                          Comment


                          • #14
                            I must be missing something as I'm not seeing the utility of this matrix.

                            Firstly, the "Matches" column does not list all of my FF matches - my son (who is listed as a match in the standard FF match list) is not shown.

                            Secondly, I do not understand why people who are listed as my FF matches are not identified as matches to me when they are added to the "selected Matches" column.

                            What am I missing?

                            Comment


                            • #15
                              Kit numbers

                              Originally posted by wighty44 View Post
                              I must be missing something as I'm not seeing the utility of this matrix.

                              Firstly, the "Matches" column does not list all of my FF matches - my son (who is listed as a match in the standard FF match list) is not shown.

                              Secondly, I do not understand why people who are listed as my FF matches are not identified as matches to me when they are added to the "selected Matches" column.

                              What am I missing?
                              Hi,

                              Could you send me a private message with you and your son's kit numbers? I will have someone check into this right away.

                              Comment

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