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Table 2 Results of Latent Class Analysis of the Internet Addiction Test and Problematic Use of the Internet Subtypes in the Chicago Sample

From: Problematic use of the Internet is a unidimensional quasi-trait with impulsive and compulsive subtypes

Classes Log Likelihood BIC Entropy LMR p
IAT Total
 1 −17,677.464a, b 35,885.634    
 2 −15,712.126a, b 32,492.383 .940 3923.374 <.001
 3 −15,213.902a, b 32,033.359 .879 994.598 .760
PUI Subtypes
 1 − 4230.458a 8842.172    
 2 − 4021.283c 8810.604 .815 417.271 .569
 3 --3883.230d,e 8925.016 .832 282.587 .766
  1. Note. LMR = Lo-Mendell-Rubin adjusted Likelihood Ratio Test when comparing the k to k – 1 class model; p = probability value for the Lo-Mendell-Rubin (LMR) adjusted Likelihood Ratio Test (LRT). IAT Total N = 1661. PUI Subtypes N = 564. aBest loglikelihood values initially obtained using 80, 16 and then replicated using 160, 32 random starting value perturbations.bProblem of nonidentification for IAT item 4 threshold 4 in class 2 (PUI). cBest loglikelihood values initially obtained using 160, 32 and then replicated using 320, 64 random starting value perturbations. dBest loglikelihood values initially obtained using 1280, 256 and then replicated using 2560, 512 random starting value perturbations. eParameter estimation problems for Auction threshold 4 in Class 2, indicating possible model non-identification