SAS Output

Item Characteristic Curve and Item Information Function: Item39

Plot of iif * skill_level

Distracter analysis table: Item39

The FREQ Procedure

Frequency Col Pct

Table of A39 by Skill_level
A39(A39)	Skill_level							Total
A39(A39)	-2	-1	0	1	2	3	4	Total
A	1 11.11	18 14.06	29 5.50	22 2.43	6 0.70	0 0.00	0 0.00	76
B	0 0.00	65 50.78	428 81.21	846 93.48	843 97.68	454 99.34	240 100.00	2876
C	4 44.44	16 12.50	38 7.21	26 2.87	13 1.51	2 0.44	0 0.00	99
D	4 44.44	29 22.66	32 6.07	11 1.22	1 0.12	1 0.22	0 0.00	78
Total	9	128	527	905	863	457	240	3129
Frequency Missing = 37

Distractor analysis plot: Item39

Plot of prob * Skill_level = A39

Distractor analysis plot: Item39

KEY39
B