SAS Output

Item Characteristic Curve and Item Information Function: Item51

Plot of iif * skill_level

Distracter analysis table: Item51

The FREQ Procedure

Frequency Col Pct

Table of A51 by Skill_level
A51(A51)	Skill_level							Total
A51(A51)	-2	-1	0	1	2	3	4	Total
A	4 40.00	29 22.31	81 15.20	56 6.16	22 2.54	4 0.88	0 0.00	196
B	2 20.00	38 29.23	267 50.09	631 69.42	745 86.13	423 92.56	234 97.50	2340
C	2 20.00	38 29.23	144 27.02	193 21.23	87 10.06	29 6.35	5 2.08	498
D	2 20.00	25 19.23	41 7.69	29 3.19	11 1.27	1 0.22	1 0.42	110
Total	10	130	533	909	865	457	240	3144
Frequency Missing = 37

Distractor analysis plot: Item51

Plot of prob * Skill_level = A51

Distractor analysis plot: Item51

KEY51
B