That's kind of surprising, Jim. Do you mean that if you and I match on FTDNA and we both have John Smiths in our matches (albeit different people with that common name) then: - one of them - both of them Would show up as ICW? I can't imagine they go just by name. Here's what I think they do: 1) all matching segments between two people are in a table 2) if you (A) and I (B) have a third person (or more) irregardless of the exact position (as the table only store the status of who matches with whom, not where as where could be more than one record/segment) then it would show this third person as ICW to both of us So it's based on atDNA but it's missing the detailed information needed to do triangulation Andreas > On 15 Dec 2015, at 23:00, Jim Bartlett via <genealogy-dna@rootsweb.com> wrote: > > Jim > > The ICW algorithm does not include arDNA. It does not include genealogy. It only matches names between your Match list and someone else's Match list. > > Jim - www.segmentology.org > >> On Dec 15, 2015, at 9:15 AM, Jim Leahy via <genealogy-dna@rootsweb.com> wrote: >> >> How does FTDNA determine the ICW status? >> >> In order for FTDNA to calculate the ICW status of an individual there must be an algorithm to evaluate the at-DNA results for that individual against some criteria based on the at-DNA results from the base pair. Has anybody been successful in back-engineering or divining the logic used for this comparison? >> >> A related question; what does the ICW "X status" actually tell us? >> >> I have seen a statement implying that it means that these individuals are "blood relatives". That would be great but seems a little too far reaching. >> >> Puzzled! >> >> Jim >> >> ssage > > > ------------------------------- > To unsubscribe from the list, please send an email to GENEALOGY-DNA-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message

Andreas OK, let me amend my statement to say FTDNA Kit number, rather than name. The point is the ICW list does not involve genetics (atDNA), it only matching Kits (individuals) that are in the match lists of both parties - a relatively simple calculation. We should not talk about segments when we examine how ICW is done - they are not part of the ICW process. Segments only come into play when we use the ICW lists to find highly probable TGs (using known overlapping segments). This works over 95% of the time (my estimate based on experience with a lot of TGs). Jim - www.segmentology.org > On Dec 15, 2015, at 11:23 PM, Andreas West <ahnen@awest.de> wrote: > > That's kind of surprising, Jim. > > Do you mean that if you and I match on FTDNA and we both have John Smiths in our matches (albeit different people with that common name) then: > > - one of them > - both of them > > Would show up as ICW? > > I can't imagine they go just by name. Here's what I think they do: > > 1) all matching segments between two people are in a table > 2) if you (A) and I (B) have a third person (or more) irregardless of the exact position (as the table only store the status of who matches with whom, not where as where could be more than one record/segment) then it would show this third person as ICW to both of us > > So it's based on atDNA but it's missing the detailed information needed to do triangulation > > Andreas > >> On 15 Dec 2015, at 23:00, Jim Bartlett via <genealogy-dna@rootsweb.com> wrote: >> >> Jim >> >> The ICW algorithm does not include arDNA. It does not include genealogy. It only matches names between your Match list and someone else's Match list. >> >> Jim - www.segmentology.org >> >>> On Dec 15, 2015, at 9:15 AM, Jim Leahy via <genealogy-dna@rootsweb.com> wrote: >>> >>> How does FTDNA determine the ICW status? >>> >>>