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Table 7 Major keywords occurrence

From: Fraud, corruption, and collusion in public procurement activities, a systematic literature review on data-driven methods

Keyword

Link strength

Occurrences

Avg. pub. Year

crime

276

19

2017

public procurement

146

15

2018

corruption

81

14

2019

fraud detection

144

11

2017

social network analysis

63

8

2013

construction industry

82

7

2018

social networking (online)

93

6

2014

learning systems

92

6

2018

data mining

76

6

2017

machine learning

71

6

2017