Conclusion: Adolescents' loneliness can be divided into low loneliness group, emotional loneliness group, and social loneliness group. Decision trees can effectively predict and classify factors that affect adolescent loneliness, and the classification effect is good. The combination of related factors varies, and the degree of correlation with adolescent loneliness varies across different profiles. Inferiority complex has the greatest impact on adolescent loneliness, followed by alienation, and personal strength is relatively small.
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