Item Characteristic Curve and Item Information Function: Item29

skill_level: 5 p: 0.982 skill_level: 4 p: 0.953 skill_level: 3 p: 0.882 skill_level: 2 p: 0.733 skill_level: 1 p: 0.502 skill_level: 0 p: 0.271 skill_level: 1 iif: 0.25 skill_level: 0 iif: 0.198 skill_level: 2 iif: 0.196 skill_level: -1 p: 0.12 skill_level: -1 p: 0.12 skill_level: -1 p: 0.12 skill_level: -1 iif: 0.106 skill_level: 3 iif: 0.104 skill_level: -2 p: 0.0479 skill_level: -2 p: 0.0479 skill_level: -2 p: 0.0479 skill_level: 4 iif: 0.0448 skill_level: -2 iif: 0.0456 skill_level: 5 iif: 0.0175 skill_level: -3 iif: 0.0178 skill_level: -3 p: 0.0182 skill_level: -3 p: 0.0182 skill_level: -3 p: 0.0182 skill_level: -3 p: 0.0182 skill_level: -4 iif: 0.00671396750049 skill_level: -4 p: 0.00675966051071 skill_level: -5 iif: 0.00249117430757 skill_level: -5 p: 0.00249741137113 skill_level: -5 p: 0.00249741137113
Plot of iif * skill_level


Distracter analysis table: Item29

The FREQ Procedure

Frequency
Col Pct
Table of A29 by Skill_level
A29(A29) Skill_level Total
-2 -1 0 1 2 3 4
A 3
30.00		 32
25.20		 221
41.62		 472
52.15		 585
67.71		 366
80.09		 213
88.75		 1892
 
B 1
10.00		 25
19.69		 50
9.42		 43
4.75		 27
3.13		 10
2.19		 5
2.08		 161
 
C 5
50.00		 34
26.77		 48
9.04		 27
2.98		 6
0.69		 2
0.44		 1
0.42		 123
 
D 1
10.00		 36
28.35		 212
39.92		 363
40.11		 246
28.47		 79
17.29		 21
8.75		 958
 
Total 10 127 531 905 864 457 240 3134
Frequency Missing = 37


Distractor analysis plot: Item29

Skill_level: 4 prob: 0.888 A29: A Skill_level: 3 prob: 0.801 A29: A Skill_level: 2 prob: 0.677 A29: A Skill_level: 1 prob: 0.522 A29: A Skill_level: -2 prob: 0.5 A29: C Skill_level: 0 prob: 0.416 A29: A Skill_level: 1 prob: 0.401 A29: D Skill_level: 0 prob: 0.399 A29: D Skill_level: -2 prob: 0.3 A29: A Skill_level: -1 prob: 0.283 A29: D Skill_level: 2 prob: 0.285 A29: D Skill_level: -1 prob: 0.268 A29: C Skill_level: -1 prob: 0.252 A29: A Skill_level: -1 prob: 0.197 A29: B Skill_level: 3 prob: 0.173 A29: D Skill_level: -2 prob: 0.1 A29: B Skill_level: -2 prob: 0.1 A29: D Skill_level: -2 prob: 0.1 A29: D Skill_level: -2 prob: 0.1 A29: D Skill_level: -2 prob: 0.1 A29: D Skill_level: -2 prob: 0.1 A29: D Skill_level: 0 prob: 0.0942 A29: B Skill_level: 0 prob: 0.0904 A29: C Skill_level: 0 prob: 0.0904 A29: C Skill_level: 0 prob: 0.0904 A29: C Skill_level: 0 prob: 0.0904 A29: C Skill_level: 0 prob: 0.0904 A29: C Skill_level: 4 prob: 0.0875 A29: D Skill_level: 1 prob: 0.0475 A29: B Skill_level: 2 prob: 0.0313 A29: B Skill_level: 1 prob: 0.0298 A29: C Skill_level: 3 prob: 0.0219 A29: B Skill_level: 4 prob: 0.0208 A29: B Skill_level: 2 prob: 0.00694444444444 A29: C Skill_level: 4 prob: 0.00416666666666 A29: C Skill_level: 3 prob: 0.00437636761487 A29: C
Plot of prob * Skill_level = A29


Distractor analysis plot: Item29

KEY29
A