SAS Output

Item Characteristic Curve and Item Information Function: Item1

Plot of iif * skill_level

Distracter analysis table: Item1

The FREQ Procedure

Frequency Col Pct

Table of A1 by Skill_level
A1(A1)	Skill_level							Total
A1(A1)	-2	-1	0	1	2	3	4	Total
A	1 8.33	14 10.77	18 3.37	30 3.30	13 1.50	2 0.44	1 0.42	79
B	3 25.00	22 16.92	52 9.74	32 3.52	8 0.92	0 0.00	0 0.00	117
C	2 16.67	25 19.23	50 9.36	39 4.29	11 1.27	0 0.00	0 0.00	127
D	6 50.00	69 53.08	414 77.53	809 88.90	833 96.30	455 99.56	239 99.58	2825
Total	12	130	534	910	865	457	240	3148
Frequency Missing = 37

Distractor analysis plot: Item1

Plot of prob * Skill_level = A1

Distractor analysis plot: Item1

KEY1
D