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Overview of the Present StudyThe present study assessed the item response parameters of the Mini-IPIP6 in a nationally representative New Zealand sample. This is the second in a series of studies aiming to provide comprehensive psychometric information validating this public domain inventory for use in the New Zealand context. In the first study in this series my colleagues and I showed that the Mini-IPIP had a reliable six-factor structure with excellent convergent and discriminant validity (Sibley et al., 2011). Here I document item response parameters (discrimination and difficulty parameters as in Equations 1.0 and 2.0) and Test Information Functions for the four items that comprise each of the six Mini-IPIP6 subscales. This assesses the extent to which the scale reliably assesses the various dimensions of personality across different levels of the latent trait range. I expected that the Mini-IPIP6 would provide relatively even Test Information Functions distributed around the average estimated level of each latent trait, and extending ideally to +/- 2 Standard Deviation units. MethodSampling procedureThe NZAVS-2009 questionnaire was posted to 40,500 participants from the 2009 NZ electoral roll. The publicly available version of the roll contained 2,986,546 registered voters. This represented all citizens over 18 years of age who were eligible to vote regardless of whether or not they chose to vote, barring people who had their contact details removed due to specific case-by-case concerns about privacy. In sum, roughly 1.36% of all people registered to vote in New Zealand were contacted and invited to participate. The NZAVS-2009 sampled a total of 6,518 participants. The overall response rate (adjusting for address accuracy of the electoral roll and including anonymous responses) was 16.6%
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