SAS Output

Item Characteristic Curve and Item Information Function: Item40

Plot of iif * skill_level

Distracter analysis table: Item40

The FREQ Procedure

Frequency Col Pct

Table of A40 by Skill_level
A40(A40)	Skill_level							Total
A40(A40)	-2	-1	0	1	2	3	4	Total
A	4 40.00	38 29.69	162 31.21	229 25.22	138 16.01	41 8.97	4 1.67	616
B	4 40.00	24 18.75	171 32.95	414 45.59	601 69.72	369 80.74	228 95.00	1811
C	1 10.00	38 29.69	108 20.81	140 15.42	56 6.50	21 4.60	2 0.83	366
D	1 10.00	28 21.88	78 15.03	125 13.77	67 7.77	26 5.69	6 2.50	331
Total	10	128	519	908	862	457	240	3124
Frequency Missing = 37

Distractor analysis plot: Item40

Plot of prob * Skill_level = A40

Distractor analysis plot: Item40

KEY40
B