Skip to main content
. 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 7.

Figure 7

Item Information Functions for polytomously scored hyperactivity/impulsivity symptoms, shown by symptom groups. Hyperactivity/Impulsivity symptoms were separated into four groups based on the similarity of their difficulty parameters. Group 1 consisted of Symptoms 10 and 17. Group 2 consisted of Symptoms 11 and 18. Group 3 consisted of Symptoms 12, 13, and 14. Group 4 consisted of Symptoms 15 and 16. Symptoms with higher Item Information Functions than other symptoms in the group are more reliable symptoms.