SAS Output

Item Characteristic Curve and Item Information Function: Item34

Plot of iif * skill_level

Distracter analysis table: Item34

The FREQ Procedure

Frequency Col Pct

Table of A34 by Skill_level
A34(A34)	Skill_level							Total
A34(A34)	-2	-1	0	1	2	3	4	Total
A	2 20.00	23 17.83	80 15.24	60 6.61	9 1.04	2 0.44	0 0.00	176
B	3 30.00	40 31.01	72 13.71	60 6.61	17 1.97	1 0.22	2 0.83	195
C	2 20.00	41 31.78	321 61.14	764 84.14	832 96.18	452 98.91	238 99.17	2650
D	3 30.00	25 19.38	52 9.90	24 2.64	7 0.81	2 0.44	0 0.00	113
Total	10	129	525	908	865	457	240	3134
Frequency Missing = 37

Distractor analysis plot: Item34

Plot of prob * Skill_level = A34

Distractor analysis plot: Item34

KEY34
C