Garcia Danilo, Persson Björn N, Al Nima Ali, Brulin Joel Gruneau, Rapp-Ricciardi Max, Kajonius Petri J
Blekinge Center of Competence, Blekinge County Council, Karlskrona, Sweden.
Department of Psychology, University of Gothenburg, Gothenburg, Sweden.
Heliyon. 2018 Mar 15;4(3):e00569. doi: 10.1016/j.heliyon.2018.e00569. eCollection 2018 Mar.
The Dark Triad (i.e., Machiavellianism, narcissism, and psychopathy) can be captured quickly with 12 items using the Dark Triad Dirty Dozen (Jonason and Webster, 2010). Previous Item Response Theory (IRT) analyses of the original English Dark Triad Dirty Dozen have shown that all three subscales adequately tap into the dark domains of personality. The aim of the present study was to analyze the Swedish version of the Dark Triad Dirty Dozen using IRT.
570 individuals ( = 326, = 242, and 2 unreported), including university students and white-collar workers with an age range between 19 and 65 years, responded to the Swedish version of the Dark Triad Dirty Dozen (Garcia et al., 2017a,b).
Contrary to previous research, we found that the narcissism scale provided most information, followed by psychopathy, and finally Machiavellianism. Moreover, the psychopathy scale required a higher level of the latent trait for endorsement of its items than the narcissism and Machiavellianism scales. Overall, all items provided reasonable amounts of information and are thus effective for discriminating between individuals. The mean item discriminations (alphas) were 1.92 for Machiavellianism, 2.31 for narcissism, and 1.99 for psychopathy.
This is the first study to provide IRT analyses of the Swedish version of the Dark Triad Dirty Dozen. Our findings add to a growing literature on the Dark Triad Dirty Dozen scale in different cultures and highlight psychometric characteristics, which can be used for comparative studies. Items tapping into psychopathy showed higher thresholds for endorsement than the other two scales. Importantly, the narcissism scale seems to provide more information about a lack of narcissism, perhaps mirroring cultural conditions.
黑暗三联征（即马基雅维利主义、自恋和精神病态）可以通过黑暗三联征十二题量表（乔纳森和韦伯斯特，2010年）中的12个项目快速测量。先前对原始英文黑暗三联征十二题量表的项目反应理论（IRT）分析表明，所有三个分量表都能充分挖掘人格的黑暗领域。本研究的目的是使用IRT分析黑暗三联征十二题量表的瑞典语版本。
570名个体（男性 = 326名，女性 = 242名，另有2名未报告），包括年龄在19至65岁之间的大学生和白领，对黑暗三联征十二题量表的瑞典语版本（加西亚等人，2017a，b）进行了回答。
与先前的研究相反，我们发现自恋分量表提供的信息最多，其次是精神病态分量表，最后是马基雅维利主义分量表。此外，与自恋和马基雅维利主义分量表相比，精神病态分量表的项目获得认可所需的潜在特质水平更高。总体而言，所有项目都提供了合理数量的信息，因此对于区分个体是有效的。马基雅维利主义的平均项目区分度（阿尔法系数）为1.92分，自恋为2.31分，精神病态为1.99分。
这是第一项对黑暗三联征十二题量表的瑞典语版本进行IRT分析的研究。我们的研究结果为不同文化背景下关于黑暗三联征十二题量表的文献增添了内容，并突出了可用于比较研究的心理测量特征。与其他两个量表相比，涉及精神病态的项目获得认可的阈值更高。重要的是，自恋分量表似乎提供了更多关于缺乏自恋的信息，这可能反映了文化状况。
