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DNA Day at the FamilySearch Library (view source)
Revision as of 07:30, 26 April 2021
, 26 April 2021→Grouping DNA Matches
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==''Grouping DNA Matches''== | ==''Grouping DNA Matches''== | ||
'''The Clustering Process''' | |||
After taking a DNA test, most people have thousands of DNA matches. Clustering is the process of grouping DNA matches by the ancestor or ancestral line on which they appear to relate. Creating clusters will allow you to organize your matches and then focus on the matches that will help solve your research goal. | |||
To create a cluster, follow this process | |||
#Choose a match with a known relationship | |||
#View shared or in-common-with matches | |||
#Create a cluster; name the cluster for the common ancestor | |||
#Add matches shared between you and the known match to that cluster | |||
#Repeat | |||
#As you identify the relationship between you and each match, view shared matches and add to the appropriate cluster | |||
'''Clustering Tools and Resources''' | |||
As you start clustering your matches, consider how some of the following tools and resources might help: | |||
* '''Color Coding''': Ancestry DNA lets users assign Matches to groups which are identified by a name a color. Currently, users can create up to 24 different groups. Carefully plan how to use these groups to create clusters. One popular method is to assign a different color to each parent, grandparent, and great grandparent. As matches are identified as belonging to these ancestors (either by determining a relationship or through shared or in-common-with), they are added to the groups. Learn more about color coding [https://thednageek.com/quick-tip-color-code-your-matches-fast/ here] and [https://dna-explained.com/2019/04/18/using-ancestrys-new-match-grouping-dots-aka-mygroupdots/ here]. | |||
* '''AutoClusters''': Some websites will build clusters for you. AutoClusters are available from [https://blog.myheritage.com/2019/02/introducing-autoclusters-for-dna-matches/ MyHeritage], [https://geneticaffairs.com/features-autocluster.html Genetic Affairs], [https://www.gedmatch.com/login1.php GEDMatch], and [https://www.dnagedcom.com/ DNAGedcom]. Note that AutoClustering is usually a Tier 1 or subscription service. | |||
* '''Leeds Method''': The Leeds Method is a method for clustering your matches by which grandparent you are related to. Learn more about the Leeds Method [https://www.danaleeds.com/the-leeds-method/ here] and [https://www.yourdnaguide.com/leeds-method here]. | |||
* '''Spreadsheets''': When working with DNA matches, it may be necessary to search for shared matches and then record a list of matches in each cluster on a spreadsheet. You may choose to create a new tab for each cluster or follow the Leeds Method. Spreadsheets are also great ways to build clusters of Matches across companies. | |||
'''Other Clustering Situations''' | |||
As you start clustering, you may run into some of the following situations. | |||
* | * '''Unknown Parents:''' When one or both parents are unknown, you cannot build clusters off of known relatives. However, clusters will help in the process of identifying those unknown parents. Start with the top match in the 1C-2C range. Build a cluster around shared matches. Repeat for all other members of the cluster. Then, take the first match not in the first cluster and build a cluster around them. | ||
* | * '''Endogamy, Pedigree Collapse, and Multiple Relationships'''. In cases of endogamy (a population which has been physically or socially isolated for hundreds of years), pedigree collapse (the same ancestors appear multiple times in the same tree) or when you are related in multiple ways to your matches, it can be difficult to create clearly defined clusters. Learn more about these kinds of situations and how to work with your DNA matches [https://blog.kittycooper.com/2017/02/endogamy-and-dna/ here], [https://www.yourdnaguide.com/ydgblog/2019/2/23/endogamy here], [https://www.yourdnaguide.com/ydgblog/2019/7/26/pedigree-collapse-and-genetic-relationships here], or [https://thednageek.com/the-endogamy-files-what-is-endogamy/ here]. | ||
* '''Matches in Multiple Clusters''': When matches unexpectedly appear in multiple clusters, it may be for a number of different reasons. First, the match may descend from a much closer ancestor but be several generations further removed. Second, the match may be related in more than one way. For example, a match can be related on both your father's side of the family and mother's side of the family. Third, the match may appear in one of the clusters because it is a false positive as the DNA company reports them as a shared match if they share DNA with both you and the match you are working with whether or not they are related on the same line. | |||
* '''Isolating Matches.''' If you are researching an ancestor, you may want to focus just on matches related to that ancestor. This will be discussed more in later presentations. | |||
==''Using DNA to Determine Relationships''== | ==''Using DNA to Determine Relationships''== | ||
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===Additional Resources=== | ===Additional Resources=== | ||
* | * | ||
==''Using DNA to Find Unknown Parents: A Case Study''== | ==''Using DNA to Find Unknown Parents: A Case Study''== | ||