SAS Output

Item Characteristic Curve and Item Information Function: Item25

Plot of iif * skill_level

Distracter analysis table: Item25

The FREQ Procedure

Frequency Col Pct

Table of A25 by Skill_level
A25(A25)	Skill_level							Total
A25(A25)	-2	-1	0	1	2	3	4	Total
A	1 11.11	26 20.16	63 11.84	50 5.49	7 0.81	1 0.22	0 0.00	148
B	2 22.22	35 27.13	287 53.95	708 77.80	811 93.97	447 97.81	239 99.58	2529
C	1 11.11	36 27.91	125 23.50	111 12.20	33 3.82	8 1.75	1 0.42	315
D	5 55.56	32 24.81	57 10.71	41 4.51	12 1.39	1 0.22	0 0.00	148
Total	9	129	532	910	863	457	240	3140
Frequency Missing = 37

Distractor analysis plot: Item25

Plot of prob * Skill_level = A25

Distractor analysis plot: Item25

KEY25
B