SAS Output

Item Characteristic Curve and Item Information Function: Item24

Plot of iif * skill_level

Distracter analysis table: Item24

The FREQ Procedure

Frequency Col Pct

Table of A24 by Skill_level
A24(A24)	Skill_level							Total
A24(A24)	-2	-1	0	1	2	3	4	Total
A	2 16.67	49 37.98	396 74.58	815 89.56	846 97.80	455 99.56	240 100.00	2803
B	5 41.67	33 25.58	30 5.65	13 1.43	1 0.12	0 0.00	0 0.00	82
C	2 16.67	23 17.83	54 10.17	43 4.73	7 0.81	2 0.44	0 0.00	131
D	3 25.00	24 18.60	51 9.60	39 4.29	11 1.27	0 0.00	0 0.00	128
Total	12	129	531	910	865	457	240	3144
Frequency Missing = 37

Distractor analysis plot: Item24

Plot of prob * Skill_level = A24

Distractor analysis plot: Item24

KEY24
A