SAS Output

Item Characteristic Curve and Item Information Function: Item37

Plot of iif * skill_level

Distracter analysis table: Item37

The FREQ Procedure

Frequency Col Pct

Table of A37 by Skill_level
A37(A37)	Skill_level							Total
A37(A37)	-2	-1	0	1	2	3	4	Total
A	4 40.00	24 19.83	73 13.85	39 4.30	17 1.98	10 2.20	6 2.50	173
B	3 30.00	32 26.45	320 60.72	828 91.29	836 97.21	445 97.80	234 97.50	2698
C	3 30.00	44 36.36	67 12.71	23 2.54	6 0.70	0 0.00	0 0.00	143
D	0 0.00	21 17.36	67 12.71	17 1.87	1 0.12	0 0.00	0 0.00	106
Total	10	121	527	907	860	455	240	3120
Frequency Missing = 37

Distractor analysis plot: Item37

Plot of prob * Skill_level = A37

Distractor analysis plot: Item37

KEY37
B