SAS Output

Item Characteristic Curve and Item Information Function: Item27

Plot of iif * skill_level

Distracter analysis table: Item27

The FREQ Procedure

Frequency Col Pct

Table of A27 by Skill_level
A27(A27)	Skill_level							Total
A27(A27)	-2	-1	0	1	2	3	4	Total
A	1 10.00	33 25.98	288 54.14	706 77.67	806 93.29	447 98.03	240 100.00	2521
B	4 40.00	35 27.56	109 20.49	82 9.02	17 1.97	2 0.44	0 0.00	249
C	4 40.00	28 22.05	62 11.65	37 4.07	13 1.50	0 0.00	0 0.00	144
D	1 10.00	31 24.41	73 13.72	84 9.24	28 3.24	7 1.54	0 0.00	224
Total	10	127	532	909	864	456	240	3138
Frequency Missing = 37

Distractor analysis plot: Item27

Plot of prob * Skill_level = A27

Distractor analysis plot: Item27

KEY27
A