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Table 1 Tag density in Connotea, CiteULike and MEDLINE on PubMed citations

From: Social tagging in the life sciences: characterizing a new metadata resource for bioinformatics

System N sampled mean median min max stand. dev. coefficient of variation
Connotea per tagging 28236 3.02 2 1 115 3.74 1.24
CiteULike per tagging 45525 2.51 2 0 44 2.16 0.86
Connotea aggregate 19118 4.15 3 1 119 5.14 1.24
CiteULike aggregate 19118 5.1 4 0 74 5.29 1.04
MEDLINE 19118 11.58 11 0 42 5.3 0.46
  1. 'N sampled' refers to the number of tagged citations considered. For example, the first row shows the statistics for the number of tags associated with distinct posts to the Connotea service. In contrast, the 'Connotea aggregate' row merges all the posts for each citation into one. In the aggregate cases, the numbers of tags reported refer to the number of distinct tags -- repeats are not counted.