SAS Output

Item Characteristic Curve and Item Information Function: Item13

Plot of iif * skill_level

Distracter analysis table: Item13

The FREQ Procedure

Frequency Col Pct

Table of A13 by Skill_level
A13(A13)	Skill_level								Total
A13(A13)	-4	-2	-1	0	1	2	3	4	Total
A	1 100.00	4 33.33	37 28.46	131 24.62	182 20.00	105 12.17	25 5.47	5 2.08	490
B	0 0.00	2 16.67	23 17.69	43 8.08	57 6.26	26 3.01	7 1.53	0 0.00	158
C	0 0.00	4 33.33	39 30.00	136 25.56	165 18.13	114 13.21	19 4.16	5 2.08	482
D	0 0.00	2 16.67	31 23.85	222 41.73	506 55.60	618 71.61	406 88.84	230 95.83	2015
Total	1	12	130	532	910	863	457	240	3145
Frequency Missing = 37

Distractor analysis plot: Item13

Plot of prob * Skill_level = A13

Distractor analysis plot: Item13

KEY13
D