Measuring malevolent character: Data using the Swedish version of Jonason's Dark Triad Dirty Dozen

The data include responses to the Swedish version of a brief questionnaire used to operationalize the Dark Triad of malevolent character: Machiavellianism, narcissism, and psychopathy. The data was collected among 342 Swedish university students and white-collar workers (see Garcia et al. (2017) [1]). In this article, we include the Swedish version of Jonason's Dark Triad Dirty Dozen questionnaire. The data is available, SPSS and cvs file, as supplementary material in this article. Additionally, we also provide the scoring key as SPSS syntax file.


a b s t r a c t
The data include responses to the Swedish version of a brief questionnaire used to operationalize the Dark Triad of malevolent character: Machiavellianism, narcissism, and psychopathy. The data was collected among 342 Swedish university students and white-collar workers (see Garcia et al. (2017) [1]). In this article, we include the Swedish version of Jonason's Dark Triad Dirty Dozen questionnaire. The data is available, SPSS and cvs file, as supplementary material in this article. Additionally, we also provide the scoring key as SPSS syntax file.
& The study had a cross-sectional design

Experimental features
The main variables were gender, Machiavellianism, narcissism, and psychopathy

Data source location
Sweden Data accessibility Data is within this article and as supplementary material

Value of the data
This data can be employed for individual statistical analysis and meta-analysis.
The data was collected in Sweden and has cultural diversity value. The questionnaire can be used for data collection among Swedish speaking participants.

Data
The Swedish version of Jonason's Dark Triad Dirty Dozen questionnaire was answered by 342 individuals.

Participants
The data were collected among 342 university students and white-collar workers with an age range between 19-65 (166 males, 175 females, and 1 who did not report gender).

Questionnaire
Jonason's Dark Triad Dirty Dozen [2] is a 12-item self-report questionnaire designed to measure the three Dark Triad traits: Machiavellianism, narcissism, and psychopathy. Participants are asked to rate how much they agreed (1 ¼ Strongly disagree; 7 ¼ Strongly agree) with statements such as: ''I tend to manipulate others to get my way'' (Machiavellianism), ''I tend to lack remorse'' (psychopathy), and ''I tend to want others to admire me'' (narcissism). See Appendix A for the questionnaire in Swedish and English. Items were averaged to create each dark trait. The data presented here obtained acceptable Cronbach's alphas for all three dark traits in the whole sample: .74 for Machiavellianism, .78 for narcissism, .63 for psychopathy, and .80 for the dark triad core (i.e., the sum of participant's scores in the three dark traits). See Table 1 for means and standard deviations for males, females and the whole sample.

Statistical issues and caveats
The validity of Jonason's Dark Triad Dirty Dozen has been criticized elsewhere [3]. Additionally, for the Swedish version of the Dark Triad Dirty Dozen we opted to use a 7-point Likert scale as recommended by Jonason in some of his studies [4]. However, in other studies, Jonason has used a 5-point Likert scale [5,6] or even a 9-point Likert scale [7]. Hence, it is difficult to compare samples. Finally, the results of our confirmatory factor analysis [1] showed that, despite having good correspondence to the English version, there was mixed evidence for model fit.

Acknowledgements
The data collection was supported by The Swedish Research Council (Dnr. 2015-01229). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. We would also like to convey our gratitude to the participants for spending their valuable time answering the questionnaires.

Appendix 1
Dark Triad Dirty Dozen 1

Instruktion
Var vänlig och indikera i vilken utsträckning du håller med respektive påstående. Försök att vara så öppen och ärlig i dina svar som möjligt. Note: One individual did not report gender, thus, her/his scores are not reported here. The dark triad core is the sum of participant's scores in the three dark traits.  12 I tend to expect special favors from others.