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Chunk #32 — 2. Method — 2.5 Analyses — 2.5.3 Traitedness

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An IRT-based measure of alcohol trait severity and the role of traitedness in trait validity: a reanalysis of Project MATCH data.
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Once appropriate items were fit to a Rasch model and item parameters were estimated, specific estimates of dependence trait level and traitedness could be computed for each participant in the project. Assessment of traitedness to these models was derived from the INFIT statistic (Linacre, 2005). Once traitedness was estimated for study individuals, the relation of this variable to other study variables was examined.