SAS Output

Item Characteristic Curve and Item Information Function: Item4

Plot of iif * skill_level

Distracter analysis table: Item4

The FREQ Procedure

Frequency Col Pct

Table of A4 by Skill_level
A4(A4)	Skill_level									Total
A4(A4)	-4	-3	-2	-1	0	1	2	3	4	Total
A	1 100.00	1 100.00	1 9.09	63 48.09	375 70.22	784 86.34	817 94.56	453 99.12	239 100.00	2734
B	0 0.00	0 0.00	3 27.27	17 12.98	24 4.49	20 2.20	6 0.69	0 0.00	0 0.00	70
C	0 0.00	0 0.00	4 36.36	24 18.32	35 6.55	25 2.75	5 0.58	0 0.00	0 0.00	93
D	0 0.00	0 0.00	3 27.27	27 20.61	100 18.73	79 8.70	36 4.17	4 0.88	0 0.00	249
Total	1	1	11	131	534	908	864	457	239	3146
Frequency Missing = 37

Distractor analysis plot: Item4

Plot of prob * Skill_level = A4

Distractor analysis plot: Item4

KEY4
A