Item Characteristic Curve and Item Information Function: Item2

skill_level: 5 p: 0.981 skill_level: 4 p: 0.951 skill_level: 3 p: 0.878 skill_level: 2 p: 0.725 skill_level: 1 p: 0.493 skill_level: 0 p: 0.263 skill_level: 1 iif: 0.25 skill_level: 2 iif: 0.199 skill_level: 0 iif: 0.194 skill_level: -1 p: 0.116 skill_level: -1 p: 0.116 skill_level: -1 p: 0.116 skill_level: 3 iif: 0.107 skill_level: -1 iif: 0.103 skill_level: 4 iif: 0.0464 skill_level: -2 iif: 0.044 skill_level: -2 p: 0.0461 skill_level: -2 p: 0.0461 skill_level: -2 p: 0.0461 skill_level: 5 iif: 0.0182 skill_level: -3 iif: 0.0172 skill_level: -3 p: 0.0175 skill_level: -3 p: 0.0175 skill_level: -4 iif: 0.00645412995118 skill_level: -4 p: 0.00649633228433 skill_level: -5 iif: 0.00239396279998 skill_level: -5 p: 0.00239972146308 skill_level: -5 p: 0.00239972146308
Plot of iif * skill_level


Distracter analysis table: Item2

The FREQ Procedure

Frequency
Col Pct
Table of A2 by Skill_level
A2(A2) Skill_level Total
-2 -1 0 1 2 3 4
A 2
16.67		 25
19.08		 62
11.74		 94
10.34		 51
5.92		 7
1.53		 0
0.00		 241
 
B 5
41.67		 43
32.82		 209
39.58		 295
32.45		 155
17.98		 47
10.28		 2
0.83		 756
 
C 2
16.67		 23
17.56		 167
31.63		 430
47.30		 608
70.53		 394
86.21		 238
99.17		 1862
 
D 3
25.00		 40
30.53		 90
17.05		 90
9.90		 48
5.57		 9
1.97		 0
0.00		 280
 
Total 12 131 528 909 862 457 240 3139
Frequency Missing = 37


Distractor analysis plot: Item2

Skill_level: 4 prob: 0.99 A2: C Skill_level: 3 prob: 0.862 A2: C Skill_level: 2 prob: 0.705 A2: C Skill_level: 1 prob: 0.473 A2: C Skill_level: -2 prob: 0.417 A2: B Skill_level: 0 prob: 0.396 A2: B Skill_level: -1 prob: 0.328 A2: B Skill_level: 1 prob: 0.325 A2: B Skill_level: 0 prob: 0.316 A2: C Skill_level: -1 prob: 0.305 A2: D Skill_level: -2 prob: 0.25 A2: D Skill_level: -1 prob: 0.191 A2: A Skill_level: -1 prob: 0.191 A2: A Skill_level: 2 prob: 0.18 A2: B Skill_level: -2 prob: 0.167 A2: C Skill_level: -1 prob: 0.176 A2: C Skill_level: -1 prob: 0.176 A2: C Skill_level: -1 prob: 0.176 A2: C Skill_level: 0 prob: 0.17 A2: D Skill_level: -2 prob: 0.167 A2: A Skill_level: 0 prob: 0.117 A2: A Skill_level: 3 prob: 0.103 A2: B Skill_level: 1 prob: 0.103 A2: A Skill_level: 1 prob: 0.103 A2: A Skill_level: 1 prob: 0.099 A2: D Skill_level: 1 prob: 0.099 A2: D Skill_level: 2 prob: 0.0592 A2: A Skill_level: 2 prob: 0.0557 A2: D Skill_level: 2 prob: 0.0557 A2: D Skill_level: 3 prob: 0.0197 A2: D Skill_level: 3 prob: 0.0153 A2: A Skill_level: 4 prob: 0.00833333333333 A2: B
Plot of prob * Skill_level = A2


Distractor analysis plot: Item2

KEY2
C