Item Characteristic Curve and Item Information Function: Item23

skill_level: 5 p: 0.99 skill_level: 4 p: 0.982 skill_level: 3 p: 0.952 skill_level: 2 p: 0.879 skill_level: 1 p: 0.727 skill_level: 0 p: 0.495 skill_level: -1 p: 0.265 skill_level: 0 iif: 0.25 skill_level: 1 iif: 0.198 skill_level: -1 iif: 0.195 skill_level: -2 p: 0.117 skill_level: -2 p: 0.117 skill_level: -2 p: 0.117 skill_level: 2 iif: 0.107 skill_level: -2 iif: 0.103 skill_level: 3 iif: 0.046 skill_level: -3 iif: 0.0444 skill_level: -3 p: 0.0465 skill_level: -3 p: 0.0465 skill_level: -3 p: 0.0465 skill_level: 4 iif: 0.018 skill_level: -4 iif: 0.0173 skill_level: -4 p: 0.0176 skill_level: 5 iif: 0.00678052268502 skill_level: -5 iif: 0.00651814387867 skill_level: -5 p: 0.00656119313401
Plot of iif * skill_level


Distracter analysis table: Item23

The FREQ Procedure

Frequency
Col Pct
Table of A23 by Skill_level
A23(A23) Skill_level Total
-4 -2 -1 0 1 2 3 4
A 1
50.00		 3
25.00		 29
22.14		 86
16.10		 129
14.18		 71
8.22		 18
3.94		 4
1.67		 341
 
B 1
50.00		 4
33.33		 29
22.14		 39
7.30		 30
3.30		 11
1.27		 3
0.66		 0
0.00		 117
 
C 0
0.00		 4
33.33		 33
25.19		 114
21.35		 104
11.43		 34
3.94		 5
1.09		 0
0.00		 294
 
D 0
0.00		 1
8.33		 40
30.53		 295
55.24		 647
71.10		 748
86.57		 431
94.31		 236
98.33		 2398
 
Total 2 12 131 534 910 864 457 240 3150
Frequency Missing = 37


Distractor analysis plot: Item23

Skill_level: 4 prob: 0.983 A23: D Skill_level: 3 prob: 0.943 A23: D Skill_level: 2 prob: 0.866 A23: D Skill_level: 1 prob: 0.711 A23: D Skill_level: 0 prob: 0.552 A23: D Skill_level: -4 prob: 0.5 A23: B Skill_level: -4 prob: 0.5 A23: A Skill_level: -2 prob: 0.333 A23: C Skill_level: -2 prob: 0.333 A23: C Skill_level: -2 prob: 0.333 A23: C Skill_level: -2 prob: 0.333 A23: C Skill_level: -2 prob: 0.333 A23: C Skill_level: -2 prob: 0.333 A23: B Skill_level: -1 prob: 0.305 A23: D Skill_level: -1 prob: 0.252 A23: C Skill_level: -2 prob: 0.25 A23: A Skill_level: -1 prob: 0.221 A23: B Skill_level: -1 prob: 0.221 A23: A Skill_level: 0 prob: 0.213 A23: C Skill_level: 0 prob: 0.161 A23: A Skill_level: 1 prob: 0.142 A23: A Skill_level: 1 prob: 0.114 A23: C Skill_level: -2 prob: 0.0833 A23: D Skill_level: 2 prob: 0.0822 A23: A Skill_level: 0 prob: 0.073 A23: B Skill_level: 3 prob: 0.0394 A23: A Skill_level: 2 prob: 0.0394 A23: C Skill_level: 1 prob: 0.033 A23: B Skill_level: 3 prob: 0.0109 A23: C Skill_level: 3 prob: 0.0109 A23: C Skill_level: 3 prob: 0.0109 A23: C Skill_level: 3 prob: 0.0109 A23: C Skill_level: 4 prob: 0.0167 A23: A Skill_level: 2 prob: 0.0127 A23: B Skill_level: 3 prob: 0.00656455142231 A23: B
Plot of prob * Skill_level = A23


Distractor analysis plot: Item23

KEY23
D