Improving Web-Based Treatment Intake for Multiple Mental and Substance Use Disorders by Text Mining and Machine Learning: Algorithm Development and Validation.

The large chi-square values and highly significant P values (when applying the O-a-A strategy, chi-square value > 3.84 is required to indicate significant differences [ P <.05]) show that there are significant differences between the observed and expected frequencies with which the keywords occur in texts written by patients with different disorders.

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