Table 3.

Item Response Theory (IRT) Item Parameters and Standard Error Estimates (IRTPRO)

Item description	Base rate (% positive)	a	SE of a	b 1	SE of b 1
Use bad words toward another resident	7.7	4.16	0.50	1.57	0.06
Scream at another resident	9.3	4.95	0.68	1.43	0.05
Try to scare, frighten, or threaten (another resident) with words	1.9	3.63	0.58	2.29	0.12
Boss around/tell another resident what to do	4.5	2.65	0.30	2.06	0.11
Hit another resident	2.0	2.60	0.38	2.48	0.16
Grab or yank another resident	1.3	2.24	0.39	2.88	0.26
Push or shove another resident	1.5	2.32	0.38	2.76	0.22
Throw things at another resident	1.0	3.52	0.69	2.58	0.17
Threaten another resident with a cane, fist, or other object	0.8	3.78	0.84	2.63	0.19
Other physical behavior like kicking, biting, scratching, or spitting at another resident	1.0	2.34	0.44	2.92	0.27
Going into another resident’s room without asking or taking/touching/damaging or breaking other residents “personal” things	3.6	1.18	0.19	3.30	0.39