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Table 2 The standard error for article volumes in 2014, average number of articles per journal, average APC for journals and articles, and average and median publication time for journals and articles

From: ‘Predatory’ open access: a longitudinal study of article volumes and market characteristics

Statistics summary Estimated value Standard error (a = 95 %)
Total article volumes published in 2014 419,273 90,954
Average number of articles per journal 2010 30 5
2011 42 9
2012 53 13
2013 49 9
2014 53 8
Average APC for journals in USD 100+ journal publisher 605 41
10–99 journal publisher 239 26
2–9 journal publisher 215 24
Single-journal publisher 98 16
Overall 304 20
Average APC for articles published (2010–2014) in USD 100+ journal publisher 796 44
10–99 journal publisher 104 15
2–9 journal publisher 133 14
Single-journal publisher 83 17
Overall 178 17
Average publication time for journals in months 100+ journal publisher 4.4 0.9
10–99 journal publisher 2.2 0.4
2–9 journal publisher 3.4 0.8
Single-journal publisher 3.9 0.7
Overall 3.6 0.4
Average publication time for articles published (2014) in months 100+ journal publisher 2.9 0.3
10–99 journal publisher 2.2 0.3
2–9 journal publisher 4.2 0.7
Single-journal publisher 4.6 0.9
Overall 3.3 0.2
   Interquartile range
Median publication time for journals in months 100+ journal publisher 2.6 (2.1, 4.5)
10–99 journal publisher 2.1 (1.0, 3.0)
2–9 journal publisher 3.7 (1.8, 4.7)
Single-journal publisher 3.2 (2.6, 5.2)
Overall 2.7 (2.0, 4.2)
Median publication time for articles published (2014) in months 100+ journal publisher 2.4 (1.5, 4.3)
10–99 journal publisher 1.9 (1.1, 3.3)
2–9 journal publisher 4.2 (2.6, 5.2)
Single-journal publisher 3.4 (1.8, 5.1)
Overall 2.7 (1.5, 4.5)