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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Psychol Assess. 2010 Sep;22(3):546–558. doi: 10.1037/a0019581

Figure 4.

Figure 4

Item Information Functions for polytomously scored inattention symptoms, shown by symptom groups. Inattention symptoms were separated into four symptoms groups based on the similarity of their difficulty parameters. Group 1 consisted of Symptoms 1, 3, 4, and 6. Group 2 consisted of Symptoms 2 and 8; both of these symptoms provided comparable information. Group 3 consisted of Symptoms 5 and 9. Group 4 consisted of only Symptom 7. Symptoms with higher Item Information Functions than other symptoms in the group are more reliable symptoms.