Chunk #16 — Materials and methods — Appropriateness of Item Response Theory to harmonize Neuroticism and Extraversion scores

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Harmonization of Neuroticism and Extraversion phenotypes across inventories and cohorts in the Genetics of Personality Consortium: an application of Item Response Theory.

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Unidimensionality was assessed by plotting the test information curves (TICs) (Lord 1980; van den Berg and Service 2012) for inventories separately and with two or more inventories combined. If two tests measure the same underlying construct, the TIC of the tests combined should be the sum of the TICs of the two separate tests. These curves also show the increase in measurement precision for those individuals that were administered multiple inventories.