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Table 2 Dataset indicator examples: record numbers as of 31 December 2009

From: Indicators for the Data Usage Index (DUI): an incentive for publishing primary biodiversity data through global information infrastructure

Indicator Formula OBIS Dec09 DanBIF-09b HUA-09a HUA-09b DK 2009b
Searched records s(u) 2,092,927 5,682,095 2,299,133 7,328,160 13,010,255
Download frequency d(u) 555,835 854,761 809,468 717,102 1,571,863
Record number r(u) 11,140,298 4,995,544 259,077 259,077 4,836,771
Search events S(u) 42,860 249,214 126,449 198,910 448,124
Download events D(u) 601 4,486 2,059 1,710 6,246
Dataset number N(u) 180 38 2 2 40
Datasets used n(u) 171 36 2 2 36
Search density s(u)/S(u) 48.83 22.80 18.18 36.84 29.03
Download density d(u)/D(u) 924.85 190.54 393.14 407.44 251.66
Usage impact d(u)/r(u) 0.05 0.17 3.12 2.77 0.32
Interest impact s(u)/r(u) 0.19 1.14 8.87 28.29 2.69
Usage ratio d(u)/s(u) 0.27 0.15 0.35 0.10 0.12
Usage balance D(u)/S(u) 0.014 0.018 0.009 0.009 0.014
  1. HUA, Herbarium of University of Aarhus; DanBIF, Danish Biodiversity Information Facility; DK, Denmark (DanBIF and HUA combined); OBIS, Ocean Biogeographic Information System. Bold indicates central impact and interest scores.