Hints on using RogersDNA analysis tools


What tools are available?
    The initial goal of this site was to provide a place for discussions by people with the Rogers surname who have had their DNA tested. It also included the DNA listings for all people in the the Rogers Surname Project. Later, the DNA information was moved from an Excel spreadsheet to a MySQL database. This provided an opportunity to perform additional analysis on the DNA data. These tools are available for you, the RogersDNA participant, to do additional analysis and comparisons on your DNA.

    The available tools, and a short summary of their usage, are listed below. Clicking on the description heading will take you to the page described.


Rogers Family Relationships
    This chart groups people together who have similar DNA. The initial groupings are made by haplotype. After that, the first listing in each group is the one who most closely matches the "modal" haplotype for that group. The listings that follow are in order of who most closly matches the person above him. If there is a difference in one or more markers, there will be a space between the entries. The size of the space indicates how close or distant the match may be. The colors in the squares between the rows indicate which markers are different, and how significant that difference is in genealogical terms. A legend at the bottom of the page indicates the relationship between colors and mutation significance. In general, red is more significant, green is less signifcant, and yellow is average.


Search for an inidividual in the genealogy database
    This provides a way for you to find an individual in any of the many genealogy GEDCOMs that have been submitted to this site.


DNA Classification
    This tool demonstrates how we classify your DNA sample into a haplogroup. The results should closely match the classification you received from your testing company, but this step is necessary to assure that you are placed in one of the groups used in the Family Relationships section described below.


DNA Cross Correlation Matrix
    This tool shows how closely you are related to each of the other participants at RogersDNA. The kit numbers of each participant are listed along the top of the page, and also along the left side. Where the row with your kit number intersects with the corresponding column with your kit number, it will show a score of 1000 (a perfect match) and a green square. Where your row or column intersects with another participant, the score will be somewhere between 0 and 1000, depending on how closely your DNA matches. In general, persons who closely match your DNA will be grouped close to you in the matrix.


Modal Haplogroup Templates
    The initial grouping for each participant is made by comparing his DNA to a group of "modal" templates. These templates have been developed by researchers who have analyzed large numbers of DNA samples. They won't necessarily be a perfect match, but they do provide a comparison reference for the majority of people within a haplotype grouping.


DNA Mutation Rates
    Each DNA marker has been determined to mutate at a different rate. From a genealogical perspective, markers that mutate often are generally less significant than those that mutate rarely. However, it is always possible for a mutation in any marker to have occured in your generation, so do not place too much emphasis on 1 or 2 differences.


Classification Methodology
    The forumula used for comparing 2 samples with each other is shown in this section. I have also included the PHP script that is used on the web pages of this site. This formula was developed by me, and has not undergone any scientific scrutiny, but it seems to work OK. If anybody has any questions or issues with the way it works, you can contact John Olson in the RogersDNA discussion area.