SAS Output

Item Characteristic Curve and Item Information Function: Item19

Plot of iif * skill_level

Distracter analysis table: Item19

The FREQ Procedure

Frequency Col Pct

Table of A19 by Skill_level
A19(A19)	Skill_level								Total
A19(A19)	-3	-2	-1	0	1	2	3	4	Total
A	0 0.00	5 41.67	28 21.88	107 20.15	150 16.54	71 8.21	26 5.69	8 3.33	395
B	0 0.00	2 16.67	24 18.75	41 7.72	56 6.17	54 6.24	13 2.84	3 1.25	193
C	1 100.00	4 33.33	62 48.44	324 61.02	616 67.92	683 78.96	405 88.62	227 94.58	2322
D	0 0.00	1 8.33	14 10.94	59 11.11	85 9.37	57 6.59	13 2.84	2 0.83	231
Total	1	12	128	531	907	865	457	240	3141
Frequency Missing = 37

Distractor analysis plot: Item19

Plot of prob * Skill_level = A19

Distractor analysis plot: Item19

KEY19
C