SAS Output

Item Characteristic Curve and Item Information Function: Item55

Plot of iif * skill_level

Distracter analysis table: Item55

The FREQ Procedure

Frequency Col Pct

Table of A55 by Skill_level
A55(A55)	Skill_level							Total
A55(A55)	-2	-1	0	1	2	3	4	Total
A	1 9.09	24 18.60	40 7.72	22 2.43	1 0.12	1 0.22	0 0.00	89
B	4 36.36	37 28.68	140 27.03	264 29.11	221 25.73	90 19.78	22 9.17	778
C	2 18.18	48 37.21	298 57.53	599 66.04	633 73.69	363 79.78	218 90.83	2161
D	4 36.36	20 15.50	40 7.72	22 2.43	4 0.47	1 0.22	0 0.00	91
Total	11	129	518	907	859	455	240	3119
Frequency Missing = 37

Distractor analysis plot: Item55

Plot of prob * Skill_level = A55

Distractor analysis plot: Item55

KEY55
C