Item Characteristic Curve and Item Information Function: Item8

skill_level: 5 p: 0.99 skill_level: 4 p: 0.977 skill_level: 3 p: 0.939 skill_level: 2 p: 0.851 skill_level: 1 p: 0.677 skill_level: 0 p: 0.435 skill_level: 0 iif: 0.246 skill_level: -1 p: 0.221 skill_level: 1 iif: 0.219 skill_level: -1 iif: 0.172 skill_level: 2 iif: 0.127 skill_level: -2 p: 0.0945 skill_level: -2 p: 0.0945 skill_level: -2 p: 0.0945 skill_level: -2 iif: 0.0856 skill_level: 3 iif: 0.057 skill_level: -3 iif: 0.0356 skill_level: -3 p: 0.037 skill_level: 4 iif: 0.0227 skill_level: -4 iif: 0.0137 skill_level: -4 p: 0.0139 skill_level: -4 p: 0.0139 skill_level: 5 iif: 0.00858789718979 skill_level: -5 iif: 0.00514174012356 skill_level: -5 p: 0.00516845303028 skill_level: -5 p: 0.00516845303028
Plot of iif * skill_level


Distracter analysis table: Item8

The FREQ Procedure

Frequency
Col Pct
Table of A8 by Skill_level
A8(A8) Skill_level Total
-2 -1 0 1 2 3 4
A 3
25.00		 11
8.53		 45
8.51		 42
4.62		 21
2.43		 4
0.88		 0
0.00		 126
 
B 3
25.00		 40
31.01		 144
27.22		 146
16.06		 71
8.22		 14
3.06		 2
0.83		 420
 
C 6
50.00		 46
35.66		 245
46.31		 596
65.57		 723
83.68		 436
95.40		 237
98.75		 2289
 
D 0
0.00		 32
24.81		 95
17.96		 125
13.75		 49
5.67		 3
0.66		 1
0.42		 305
 
Total 12 129 529 909 864 457 240 3140
Frequency Missing = 37


Distractor analysis plot: Item8

Skill_level: 4 prob: 0.988 A8: C Skill_level: 3 prob: 0.954 A8: C Skill_level: 2 prob: 0.837 A8: C Skill_level: 1 prob: 0.656 A8: C Skill_level: -2 prob: 0.5 A8: C Skill_level: 0 prob: 0.463 A8: C Skill_level: -1 prob: 0.357 A8: C Skill_level: -1 prob: 0.31 A8: B Skill_level: 0 prob: 0.272 A8: B Skill_level: -2 prob: 0.25 A8: B Skill_level: -1 prob: 0.248 A8: D Skill_level: -2 prob: 0.25 A8: A Skill_level: -2 prob: 0.25 A8: A Skill_level: 0 prob: 0.18 A8: D Skill_level: 1 prob: 0.161 A8: B Skill_level: 1 prob: 0.138 A8: D Skill_level: 2 prob: 0.0822 A8: B Skill_level: 0 prob: 0.0851 A8: A Skill_level: -1 prob: 0.0853 A8: A Skill_level: 2 prob: 0.0567 A8: D Skill_level: 1 prob: 0.0462 A8: A Skill_level: 3 prob: 0.0306 A8: B Skill_level: 2 prob: 0.0243 A8: A Skill_level: 4 prob: 0.00833333333333 A8: B Skill_level: 3 prob: 0.00875273522975 A8: A Skill_level: 4 prob: 0.00416666666666 A8: D Skill_level: 4 prob: 0.00416666666666 A8: D Skill_level: 4 prob: 0.00416666666666 A8: D Skill_level: 3 prob: 0.00656455142231 A8: D Skill_level: 3 prob: 0.00656455142231 A8: D
Plot of prob * Skill_level = A8


Distractor analysis plot: Item8

KEY8
C