SAS Output

Item Characteristic Curve and Item Information Function: Item52

Plot of iif * skill_level

Distracter analysis table: Item52

The FREQ Procedure

Frequency Col Pct

Table of A52 by Skill_level
A52(A52)	Skill_level							Total
A52(A52)	-2	-1	0	1	2	3	4	Total
A	1 11.11	61 47.29	422 79.62	862 94.62	850 98.27	456 99.78	240 100.00	2892
B	0 0.00	21 16.28	27 5.09	16 1.76	2 0.23	0 0.00	0 0.00	66
C	6 66.67	30 23.26	41 7.74	22 2.41	9 1.04	1 0.22	0 0.00	109
D	2 22.22	17 13.18	40 7.55	11 1.21	4 0.46	0 0.00	0 0.00	74
Total	9	129	530	911	865	457	240	3141
Frequency Missing = 37

Distractor analysis plot: Item52

Plot of prob * Skill_level = A52

Distractor analysis plot: Item52

KEY52
A