Table 2

Dataset indicator examples: record numbers as of 31 December 2009

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


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.

Ingwersen and Chavan BMC Bioinformatics 2011 12(Suppl 15):S3   doi:10.1186/1471-2105-12-S15-S3

Open Data