SAS Output

Item Characteristic Curve and Item Information Function: Item30

Plot of iif * skill_level

Distracter analysis table: Item30

The FREQ Procedure

Frequency Col Pct

Table of A30 by Skill_level
A30(A30)	Skill_level							Total
A30(A30)	-2	-1	0	1	2	3	4	Total
A	1 11.11	32 25.20	292 55.30	705 77.39	801 92.71	450 98.47	239 99.58	2520
B	4 44.44	35 27.56	110 20.83	145 15.92	58 6.71	6 1.31	1 0.42	359
C	1 11.11	38 29.92	60 11.36	38 4.17	2 0.23	0 0.00	0 0.00	139
D	3 33.33	22 17.32	66 12.50	23 2.52	3 0.35	1 0.22	0 0.00	118
Total	9	127	528	911	864	457	240	3136
Frequency Missing = 37

Distractor analysis plot: Item30

Plot of prob * Skill_level = A30

Distractor analysis plot: Item30

KEY30
A