SAS Output

Item Characteristic Curve and Item Information Function: Item17

Plot of iif * skill_level

Distracter analysis table: Item17

The FREQ Procedure

Frequency Col Pct

Table of A17 by Skill_level
A17(A17)	Skill_level							Total
A17(A17)	-2	-1	0	1	2	3	4	Total
A	1 8.33	15 11.63	55 10.32	75 8.24	38 4.41	6 1.32	1 0.42	191
B	1 8.33	24 18.60	64 12.01	105 11.54	62 7.19	17 3.73	1 0.42	274
C	2 16.67	42 32.56	159 29.83	426 46.81	622 72.16	418 91.67	238 99.17	1907
D	8 66.67	48 37.21	255 47.84	304 33.41	140 16.24	15 3.29	0 0.00	770
Total	12	129	533	910	862	456	240	3142
Frequency Missing = 37

Distractor analysis plot: Item17

Plot of prob * Skill_level = A17

Distractor analysis plot: Item17

KEY17
C