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Table 8 Significance of the features in \({\mathcal {F}}_1\)

From: Semi-supervised learning for detecting human trafficking

No. Feature group \(\chi ^2\) Selected
1 Advertisement language pattern   
 Third person language 8.4 \(\checkmark \)
 First person plural pronouns 9.5 \(\checkmark \)
 Kolmogorov complexity 0.7 \(\checkmark \)
 n-grams (1) 0.4  
 n-grams (2) 0.0  
 n-grams (3) 0.4  
2 Words and phrases of interest 0.0  
3 Countries of interest 59.3 \(\checkmark \)
4 Multiple victims advertised 14.1 \(\checkmark \)
5 Victim weight 0.2  
6 Reference to website or spa massage therapy   
 Reference to website 0.1  
 Reference to spa massage therapy 33.5 \(\checkmark \)
  1. The check-marked features show the top features