SAS Output

Item Characteristic Curve and Item Information Function: Item7

Plot of iif * skill_level

Distracter analysis table: Item7

The FREQ Procedure

Frequency Col Pct

Table of A7 by Skill_level
A7(A7)	Skill_level								Total
A7(A7)	-3	-2	-1	0	1	2	3	4	Total
A	0 0.00	3 27.27	64 48.85	170 31.95	238 26.13	97 11.21	13 2.84	2 0.83	587
B	1 100.00	3 27.27	52 39.69	323 60.71	654 71.79	764 88.32	442 96.72	238 99.17	2477
C	0 0.00	2 18.18	5 3.82	15 2.82	12 1.32	2 0.23	1 0.22	0 0.00	37
D	0 0.00	3 27.27	10 7.63	24 4.51	7 0.77	2 0.23	1 0.22	0 0.00	47
Total	1	11	131	532	911	865	457	240	3148
Frequency Missing = 37

Distractor analysis plot: Item7

Plot of prob * Skill_level = A7

Distractor analysis plot: Item7

KEY7
B