SAS Output

Item Characteristic Curve and Item Information Function: Item6

Plot of iif * skill_level

Distracter analysis table: Item6

The FREQ Procedure

Frequency Col Pct

Table of A6 by Skill_level
A6(A6)	Skill_level							Total
A6(A6)	-2	-1	0	1	2	3	4	Total
A	3 25.00	42 32.31	182 34.34	182 20.02	80 9.25	9 1.97	2 0.83	500
B	3 25.00	18 13.85	45 8.49	17 1.87	2 0.23	0 0.00	0 0.00	85
C	4 33.33	19 14.62	42 7.92	28 3.08	7 0.81	0 0.00	0 0.00	100
D	2 16.67	51 39.23	261 49.25	682 75.03	776 89.71	448 98.03	238 99.17	2458
Total	12	130	530	909	865	457	240	3143
Frequency Missing = 37

Distractor analysis plot: Item6

Plot of prob * Skill_level = A6

Distractor analysis plot: Item6

KEY6
D