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. 2016 Mar 1;4:e1748. doi: 10.7717/peerj.1748

Figure 5. Item information curves for each of the 12 items of the Dirty Dozen.

Figure 5

Note that item 1 (Manipulate) and 4 (Exploit) deliver the most information on the latent Dark Triad (labeled theta). Item 8 (Cynicism) delivers the least information. Furthermore, the three first items on narcissism (9–11) don’t deliver much predictive information (flat curves, cf. earlier CFA bi-factor model) to the overall Dark Triad trait—However, an IRT with only the narcissism items confirms that these predict the latent trait (theta, i.e., narcissism) very satisfactorily (cf. earlier CFA hierarchical model).