SAS Output

Item Characteristic Curve and Item Information Function: Item22

Plot of iif * skill_level

Distracter analysis table: Item22

The FREQ Procedure

Frequency Col Pct

Table of A22 by Skill_level
A22(A22)	Skill_level								Total
A22(A22)	-3	-2	-1	0	1	2	3	4	Total
A	0 0.00	2 16.67	46 37.40	324 61.48	687 76.67	814 94.43	447 97.81	237 98.75	2557
B	0 0.00	3 25.00	24 19.51	49 9.30	48 5.36	12 1.39	3 0.66	2 0.83	141
C	0 0.00	4 33.33	20 16.26	42 7.97	37 4.13	4 0.46	0 0.00	0 0.00	107
D	1 100.00	3 25.00	33 26.83	112 21.25	124 13.84	32 3.71	7 1.53	1 0.42	313
Total	1	12	123	527	896	862	457	240	3118
Frequency Missing = 37

Distractor analysis plot: Item22

Plot of prob * Skill_level = A22

Distractor analysis plot: Item22

KEY22
A