Item Characteristic Curve and Item Information Function: Item11

skill_level: 5 p: 0.985 skill_level: 4 p: 0.961 skill_level: 3 p: 0.9 skill_level: 2 p: 0.769 skill_level: 1 p: 0.55 skill_level: 0 p: 0.31 skill_level: 1 iif: 0.248 skill_level: 0 iif: 0.214 skill_level: 2 iif: 0.178 skill_level: -1 p: 0.142 skill_level: -1 iif: 0.122 skill_level: 3 iif: 0.0898 skill_level: -2 iif: 0.054 skill_level: -2 p: 0.0573 skill_level: -2 p: 0.0573 skill_level: -2 p: 0.0573 skill_level: -2 p: 0.0573 skill_level: -2 p: 0.0573 skill_level: 4 iif: 0.0376 skill_level: -3 iif: 0.0214 skill_level: -3 p: 0.0219 skill_level: -3 p: 0.0219 skill_level: 5 iif: 0.0146 skill_level: -4 iif: 0.00809594358532 skill_level: -4 p: 0.00816257115315 skill_level: -4 p: 0.00816257115315 skill_level: -4 p: 0.00816257115315 skill_level: -5 iif: 0.00300930548759 skill_level: -5 p: 0.0030184163247 skill_level: -5 p: 0.0030184163247
Plot of iif * skill_level


Distracter analysis table: Item11

The FREQ Procedure

Frequency
Col Pct
Table of A11 by Skill_level
A11(A11) Skill_level Total
-2 -1 0 1 2 3 4
A 4
33.33		 18
13.95		 80
15.04		 60
6.61		 19
2.20		 1
0.22		 0
0.00		 182
 
B 4
33.33		 18
13.95		 25
4.70		 34
3.74		 2
0.23		 0
0.00		 0
0.00		 83
 
C 4
33.33		 59
45.74		 242
45.49		 357
39.32		 181
20.95		 29
6.35		 4
1.67		 876
 
D 0
0.00		 34
26.36		 185
34.77		 457
50.33		 662
76.62		 427
93.44		 236
98.33		 2001
 
Total 12 129 532 908 864 457 240 3142
Frequency Missing = 37


Distractor analysis plot: Item11

Skill_level: 4 prob: 0.983 A11: D Skill_level: 3 prob: 0.934 A11: D Skill_level: 2 prob: 0.766 A11: D Skill_level: 1 prob: 0.503 A11: D Skill_level: -1 prob: 0.457 A11: C Skill_level: 0 prob: 0.455 A11: C Skill_level: 1 prob: 0.393 A11: C Skill_level: 0 prob: 0.348 A11: D Skill_level: -2 prob: 0.333 A11: C Skill_level: -2 prob: 0.333 A11: C Skill_level: -2 prob: 0.333 A11: C Skill_level: -2 prob: 0.333 A11: C Skill_level: -2 prob: 0.333 A11: B Skill_level: -2 prob: 0.333 A11: A Skill_level: -1 prob: 0.264 A11: D Skill_level: 2 prob: 0.209 A11: C Skill_level: 0 prob: 0.15 A11: A Skill_level: -1 prob: 0.14 A11: B Skill_level: -1 prob: 0.14 A11: A Skill_level: 1 prob: 0.0661 A11: A Skill_level: 3 prob: 0.0635 A11: C Skill_level: 0 prob: 0.047 A11: B Skill_level: 1 prob: 0.0374 A11: B Skill_level: 2 prob: 0.022 A11: A Skill_level: 4 prob: 0.0167 A11: C Skill_level: 3 prob: 0.00218818380743 A11: A Skill_level: 2 prob: 0.00231481481481 A11: B
Plot of prob * Skill_level = A11


Distractor analysis plot: Item11

KEY11
D