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Analysis of trees on Ancestry.com

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The following data provides a summary of results obtained from an analysis of Family Trees on the Ancestry.com web site.

The objective was to gauge the frequency at which the lineage providers included information in the "Notes" and "Sources" sections of the Ancestry Trees.

The sample universe is for the most common surname given in the 1990 US census, coupled with the most common male given name "John". That is, these data are for all "John Smith", "John Johnson", etc, for which lineages are found in the Ancestry database. This analysis is based on data retrieved 5 September, 2007. At that time Ancestry's database included 502,305,276 names. This sample includes a total of 664264 names, or about 0.1% of the total in Ancestry's database.


Number of lineages Percent of Lineages
Surname N Nn Ns Nn+s Nn Ns Nn+s
Smith 139051 27806 37000 10089 20.0% 26.6% 7.3%
Johnson 59328 11637 16147 4336 19.6% 27.2% 7.3%
Williams 65117 12561 16629 4356 19.3% 25.5% 6.7%
Jones 58393 12313 14672 4025 21.1% 25.1% 6.9%
Brown 70890 13842 18976 4903 19.5% 26.8% 6.9%
Davis 57989 11481 15248 3934 19.8% 26.3% 6.8%
Miller 62308 11902 15750 3894 19.1% 25.3% 6.2%
Wilson 48334 9254 12437 3267 19.1% 25.7% 6.8%
Moore 46704 9133 11792 3027 19.6% 25.2% 6.5%
Taylor 56150 11030 14533 3774 19.6% 25.9% 6.7%
N=Total number of lineages
Nn=number of lineages with notes
Ns=Number of lineages with sources
Nn+s=Number of lineages with notes AND sources

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