SAS Output

Item Characteristic Curve and Item Information Function: Item10

Plot of iif * skill_level

Distracter analysis table: Item10

The FREQ Procedure

Frequency Col Pct

Table of A10 by Skill_level
A10(A10)	Skill_level								Total
A10(A10)	-3	-2	-1	0	1	2	3	4	Total
A	1 100.00	0 0.00	50 39.06	334 63.74	778 85.78	829 96.06	449 98.25	240 100.00	2681
B	0 0.00	2 22.22	30 23.44	113 21.56	63 6.95	29 3.36	5 1.09	0 0.00	242
C	0 0.00	3 33.33	25 19.53	34 6.49	20 2.21	2 0.23	2 0.44	0 0.00	86
D	0 0.00	4 44.44	23 17.97	43 8.21	46 5.07	3 0.35	1 0.22	0 0.00	120
Total	1	9	128	524	907	863	457	240	3129
Frequency Missing = 37

Distractor analysis plot: Item10

Plot of prob * Skill_level = A10

Distractor analysis plot: Item10

KEY10
A