SAS Output

Item Characteristic Curve and Item Information Function: Item53

Plot of iif * skill_level

Distracter analysis table: Item53

The FREQ Procedure

Frequency Col Pct

Table of A53 by Skill_level
A53(A53)	Skill_level							Total
A53(A53)	-2	-1	0	1	2	3	4	Total
A	3 30.00	24 18.90	51 9.62	23 2.52	10 1.16	2 0.44	0 0.00	113
B	4 40.00	27 21.26	30 5.66	28 3.07	9 1.04	2 0.44	2 0.83	102
C	2 20.00	47 37.01	402 75.85	825 90.56	830 95.95	452 98.91	238 99.17	2796
D	1 10.00	29 22.83	47 8.87	35 3.84	16 1.85	1 0.22	0 0.00	129
Total	10	127	530	911	865	457	240	3140
Frequency Missing = 37

Distractor analysis plot: Item53

Plot of prob * Skill_level = A53

Distractor analysis plot: Item53

KEY53
C