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Table 1 Different features and their corresponding groups

From: Semi-supervised learning for detecting human trafficking

No. Feature group References
1 Advertisement language pattern [6, 25, 26]
 Third person language
 First person plural pronouns
 Kolmogorov complexity
 n-grams (1)
 n-grams (2)
 n-grams (3)
2 Words and phrases of interest [27,28,29]
3 Countries of interest [3]
4 Multiple victims advertised [6]
5 Victim weight [2, 30]
6 Reference to website or spa massage therapy [6]
 Reference to a website
 Reference to a spa massage therapy