Chunk #13 — Some general methodological considerations — Selection of symptoms or questionnaire items — Item content: severity

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Does nature have joints worth carving? A discussion of taxometrics, model-based clustering and latent variable mixture modeling.

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Endorsement probabilities are directly related to the item content in terms of severity: more severe symptoms are less likely to be endorsed, and it is necessary to carefully select a set of items that is adequate for the purpose of investigating the nature of the latent structure.