SAS Output

Item Characteristic Curve and Item Information Function: Item15

Plot of iif * skill_level

Distracter analysis table: Item15

The FREQ Procedure

Frequency Col Pct

Table of A15 by Skill_level
A15(A15)	Skill_level							Total
A15(A15)	-2	-1	0	1	2	3	4	Total
A	2 25.00	43 33.33	79 14.88	46 5.05	18 2.08	2 0.44	1 0.42	191
B	4 50.00	41 31.78	153 28.81	184 20.20	81 9.36	19 4.16	2 0.83	484
C	1 12.50	24 18.60	56 10.55	19 2.09	6 0.69	0 0.00	0 0.00	106
D	1 12.50	21 16.28	243 45.76	662 72.67	760 87.86	436 95.40	237 98.75	2360
Total	8	129	531	911	865	457	240	3141
Frequency Missing = 37

Distractor analysis plot: Item15

Plot of prob * Skill_level = A15

Distractor analysis plot: Item15

KEY15
D