Item Characteristic Curve and Item Information Function: Item12

skill_level: 5 p: 1 skill_level: 4 p: 0.99 skill_level: 3 p: 0.973 skill_level: 2 p: 0.929 skill_level: 1 p: 0.828 skill_level: 0 p: 0.639 skill_level: -1 p: 0.394 skill_level: -1 iif: 0.239 skill_level: 0 iif: 0.231 skill_level: -2 p: 0.193 skill_level: -2 iif: 0.156 skill_level: 1 iif: 0.143 skill_level: -3 p: 0.0809 skill_level: -3 p: 0.0809 skill_level: -3 p: 0.0809 skill_level: -3 p: 0.0809 skill_level: -3 p: 0.0809 skill_level: -3 iif: 0.0744 skill_level: 2 iif: 0.066 skill_level: -4 iif: 0.0304 skill_level: -4 p: 0.0314 skill_level: 3 iif: 0.0266 skill_level: -5 iif: 0.0116 skill_level: 4 iif: 0.0101 skill_level: -5 p: 0.0118 skill_level: 5 iif: 0.00378160605283
Plot of iif * skill_level


Distracter analysis table: Item12

The FREQ Procedure

Frequency
Col Pct
Table of A12 by Skill_level
A12(A12) Skill_level Total
-2 -1 0 1 2 3 4
A 1
8.33		 30
23.44		 49
9.19		 35
3.85		 11
1.27		 3
0.66		 0
0.00		 129
 
B 3
25.00		 21
16.41		 66
12.38		 52
5.71		 31
3.58		 6
1.31		 1
0.42		 180
 
C 3
25.00		 46
35.94		 336
63.04		 769
84.51		 805
93.06		 443
96.94		 239
99.58		 2641
 
D 5
41.67		 31
24.22		 82
15.38		 54
5.93		 18
2.08		 5
1.09		 0
0.00		 195
 
Total 12 128 533 910 865 457 240 3145
Frequency Missing = 37


Distractor analysis plot: Item12

Skill_level: 4 prob: 1 A12: C Skill_level: 3 prob: 0.969 A12: C Skill_level: 2 prob: 0.931 A12: C Skill_level: 1 prob: 0.845 A12: C Skill_level: 0 prob: 0.63 A12: C Skill_level: -2 prob: 0.417 A12: D Skill_level: -1 prob: 0.359 A12: C Skill_level: -2 prob: 0.25 A12: B Skill_level: -1 prob: 0.242 A12: D Skill_level: -2 prob: 0.25 A12: C Skill_level: -2 prob: 0.25 A12: C Skill_level: -2 prob: 0.25 A12: C Skill_level: -2 prob: 0.25 A12: C Skill_level: -2 prob: 0.25 A12: C Skill_level: -1 prob: 0.234 A12: A Skill_level: -1 prob: 0.164 A12: B Skill_level: 0 prob: 0.154 A12: D Skill_level: 0 prob: 0.124 A12: B Skill_level: 0 prob: 0.0919 A12: A Skill_level: -2 prob: 0.0833 A12: A Skill_level: 1 prob: 0.0593 A12: D Skill_level: 1 prob: 0.0593 A12: D Skill_level: 1 prob: 0.0593 A12: D Skill_level: 1 prob: 0.0593 A12: D Skill_level: 1 prob: 0.0571 A12: B Skill_level: 1 prob: 0.0385 A12: A Skill_level: 2 prob: 0.0358 A12: B Skill_level: 2 prob: 0.0208 A12: D Skill_level: 3 prob: 0.0109 A12: D Skill_level: 3 prob: 0.0109 A12: D Skill_level: 3 prob: 0.0109 A12: D Skill_level: 3 prob: 0.0131 A12: B Skill_level: 2 prob: 0.0127 A12: A Skill_level: 4 prob: 0.00416666666666 A12: B Skill_level: 3 prob: 0.00656455142231 A12: A
Plot of prob * Skill_level = A12


Distractor analysis plot: Item12

KEY12
C