Item Characteristic Curve and Item Information Function: Item31

skill_level: 5 p: 0.915 skill_level: 4 p: 0.799 skill_level: 3 p: 0.594 skill_level: 2 p: 0.35 skill_level: 3 iif: 0.241 skill_level: 2 iif: 0.227 skill_level: 1 p: 0.165 skill_level: 4 iif: 0.161 skill_level: 1 iif: 0.138 skill_level: 5 iif: 0.0775 skill_level: 0 p: 0.0679 skill_level: 0 p: 0.0679 skill_level: 0 p: 0.0679 skill_level: 0 p: 0.0679 skill_level: 0 p: 0.0679 skill_level: 0 p: 0.0679 skill_level: 0 p: 0.0679 skill_level: 0 iif: 0.0633 skill_level: -1 iif: 0.0254 skill_level: -1 p: 0.0261 skill_level: -1 p: 0.0261 skill_level: -2 iif: 0.00966147310044 skill_level: -2 p: 0.00975666562455 skill_level: -3 iif: 0.00359850723716 skill_level: -3 p: 0.00361155053443 skill_level: -3 p: 0.00361155053443 skill_level: -4 iif: 0.00132988196948 skill_level: -4 p: 0.00133165527526 skill_level: -5 iif: 0.00049006092242 skill_level: -5 p: 0.0004903013178
Plot of iif * skill_level


Distracter analysis table: Item31

The FREQ Procedure

Frequency
Col Pct
Table of A31 by Skill_level
A31(A31) Skill_level Total
-2 -1 0 1 2 3 4
A 4
33.33		 37
28.91		 180
33.96		 422
46.37		 445
51.50		 217
47.48		 95
39.58		 1400
 
B 5
41.67		 31
24.22		 81
15.28		 97
10.66		 44
5.09		 14
3.06		 1
0.42		 273
 
C 2
16.67		 48
37.50		 166
31.32		 185
20.33		 93
10.76		 22
4.81		 3
1.25		 519
 
D 1
8.33		 12
9.38		 103
19.43		 206
22.64		 282
32.64		 204
44.64		 141
58.75		 949
 
Total 12 128 530 910 864 457 240 3141
Frequency Missing = 37


Distractor analysis plot: Item31

Skill_level: 4 prob: 0.588 A31: D Skill_level: 2 prob: 0.515 A31: A Skill_level: 3 prob: 0.475 A31: A Skill_level: 1 prob: 0.464 A31: A Skill_level: 3 prob: 0.446 A31: D Skill_level: -2 prob: 0.417 A31: B Skill_level: 4 prob: 0.396 A31: A Skill_level: -1 prob: 0.375 A31: C Skill_level: 0 prob: 0.34 A31: A Skill_level: -2 prob: 0.333 A31: A Skill_level: 2 prob: 0.326 A31: D Skill_level: 0 prob: 0.313 A31: C Skill_level: -1 prob: 0.289 A31: A Skill_level: -1 prob: 0.242 A31: B Skill_level: 1 prob: 0.226 A31: D Skill_level: 1 prob: 0.203 A31: C Skill_level: 0 prob: 0.194 A31: D Skill_level: -2 prob: 0.167 A31: C Skill_level: 0 prob: 0.153 A31: B Skill_level: 2 prob: 0.108 A31: C Skill_level: 1 prob: 0.107 A31: B Skill_level: -1 prob: 0.0938 A31: D Skill_level: -2 prob: 0.0833 A31: D Skill_level: 3 prob: 0.0481 A31: C Skill_level: 2 prob: 0.0509 A31: B Skill_level: 3 prob: 0.0306 A31: B Skill_level: 4 prob: 0.0125 A31: C Skill_level: 4 prob: 0.00416666666666 A31: B
Plot of prob * Skill_level = A31


Distractor analysis plot: Item31

KEY31
D