SAS Output

Item Characteristic Curve and Item Information Function: Item49

Plot of iif * skill_level

Distracter analysis table: Item49

The FREQ Procedure

Frequency Col Pct

Table of A49 by Skill_level
A49(A49)	Skill_level							Total
A49(A49)	-2	-1	0	1	2	3	4	Total
A	4 33.33	21 16.15	72 13.53	57 6.26	13 1.50	1 0.22	0 0.00	168
B	4 33.33	62 47.69	307 57.71	721 79.23	790 91.33	446 97.59	238 99.17	2568
C	2 16.67	21 16.15	71 13.35	56 6.15	14 1.62	3 0.66	0 0.00	167
D	2 16.67	26 20.00	82 15.41	76 8.35	48 5.55	7 1.53	2 0.83	243
Total	12	130	532	910	865	457	240	3146
Frequency Missing = 37

Distractor analysis plot: Item49

Plot of prob * Skill_level = A49

Distractor analysis plot: Item49

KEY49
B