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Why is the database size important?

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Why the database size is important?

Whether your goal is to verify your genealogy or to discover your deep ancestral origins, the size of the testing company's database is of fundamental importance.  To get the best and most accurate answer, you want to compare your results with as many others as possible, which means choosing the company with the largest and most robust database.

Family Tree DNA is in the lead - their databases are several times larger than all the others' combined! Nine out of ten surname projects are currently hosted by the company who have built strong customer loyalty because of their scientific integrity, excellent level of service and responsiveness to the requirements of both participants and volunteer project administrators.

The Genographic Project - Family Tree DNA provides the tests for this partnership between the National Geographic Society, IBM and the Waitt Family Foundation.  The Genographic Project is a real time effort to map how humankind populated the earth.
https://www.familytreedna.com/genographic-project.aspx