You have been very friendly for this thorough explanation. I have understood it all perfectly. Greetings, Daniel Suarez > Date: Fri, 24 Feb 2012 16:12:24 +1100 > From: tdrobb@gmail.com > To: y-dna-haplogroup-i@rootsweb.com > Subject: Re: [yDNAhgI] STR Branches, SNP's, Geographic Origin > > Daniel, > The data sources I used, for the STR 67-markers, are from various public > FTDNA Projects (mainly the I1 Project), plus data from Ysearch (making sure > not to double count the same data). > > The maps are the *frequency* of occurrence of the particular branch within > the given country/region. Here the frequency is the number of people in the > branch, divided by the number of people that have been tested in the > region. That weighting hopefully reduces the bias of popular DNA testing > regions like England, compared to some less popular testing regions. > > For your I2.0110* Branch, that frequency comes out highest in France and > Switzerland. Numerically, there are a large number of I2.0110* people with > a reported origin from England, but that large number should be scaled down > by the correspondingly large number of people from England that have taken > the STR 67-marker test. After that is accounted for, places like France and > Switzerland come out the dominant (highest frequency) place. But England, > and even Norway, still have a significant frequency of I2.0110*. (In > contrast, the I2.00* branch for example, has a very low frequency in > England, and a high frequency in Eastern Europe.) > > Terry > > 2012/2/23 Daniel Suárez Díaz <dsuarez_job@hotmail.com> > > > > > Terry, > > > > Thank you for share your work. Let me make you some questions about the > > branch I2.0110*. These branch correspon to the I2ab2 haplogroup and > > acording to the studies of Hans de Beule, the present day distribution is > > limited to the Upper Rhine and the British Isles. Also in the I2ab2 FDNA > > project, the most of the samples are British. However in your I2.0110* map > > with 63 samples, the major figures correspon to France and Switzerland. > > > > Therefore my questions are: > > > > - How many French and Swiss samples have you used? > > > > - Which are your sources? > > > > - And if the sources are public, Have you overweighted them or in other > > words, Have you underweighted the British samples because many of them are > > the same family? > > > > Thanks in advance. > > > > Daniel Suarez. > > > > > > > > > > > Date: Thu, 23 Feb 2012 01:27:04 +1100 > > > From: tdrobb@gmail.com > > > To: Y-DNA-HAPLOGROUP-I@rootsweb.com > > > Subject: [yDNAhgI] STR Branches, SNP's, Geographic Origin > > > > > > Often people ask about what SNP's they should look at testing, given > > their > > > particular STR values. In addition, people sometimes ask what can be said > > > about their ancestral geographic origin based again on their STR values. > > > > > > One can in fact answer those types of questions in an objective sense. > > > > > > The methodology I used is quite simple. First, I collected as much STR > > > haplotype data as I could (I got over eight thousand I1 and I2 samples > > from > > > various FTDNA Projects and from the Ysearch database). Next, I organised > > > that large STR dataset into "hierarchical clusters" using a standard > > > mathematical technique. Finally, I counted up the number of SNP alleles > > > (either positive or negative) that occurred within each cluster, now > > called > > > an STR "Branch", and I displayed the results; and I also plotted maps of > > > the frequency distribution of the most-distant-known-ancestor of each STR > > > Branch member across all regions of Europe. > > > > > > The results are very informative. > > > > > > The answer to many questions just depend on knowing your STR "Branch > > Code". > > > In the system I use, the Branch Code is essentially just a way of > > labelling > > > the STR branches in the computed hierarchical tree, and it is very > > similar > > > to the "Henry System" used in genealogy for numbering the descendants of > > an > > > ancestor. > > > > > > To determine your very own STR Branch Code in the system I use, see: > > > http://www.goggo.com/cgi-bin/branchFind.cgi > > > > > > Enter you FTDNA Kit Number or Ysearch ID, and (hopefully) it will return > > > your STR Branch Code. (Only works for y-haplogroups I1 and I2, and 67 or > > > more STR markers at present.) > > > > > > Follow the links to see what your STR Branch Code can tell you. > > > > > > Terry > > > > > > ------------------------------- > > > To unsubscribe from the list, please send an email to > > Y-DNA-HAPLOGROUP-I-request@rootsweb.com with the word 'unsubscribe' > > without the quotes in the subject and the body of the message > > > > > > ------------------------------- > > To unsubscribe from the list, please send an email to > > Y-DNA-HAPLOGROUP-I-request@rootsweb.com with the word 'unsubscribe' > > without the quotes in the subject and the body of the message > > > > ------------------------------- > To unsubscribe from the list, please send an email to Y-DNA-HAPLOGROUP-I-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message