30
Table 3. Testee average ability, item difficulty, and step threshold of each item, and the item fit test with the PCM model of seven categories politomus scaling
Item Number
Difficulty Aspect
Step Infit
MNSQ RESULT
1 2
3 4
5 6
II. Basic Skill
1. Observation Skill
1.1 0.49
Mean Ability -0.6 -0.52
NA -0.54 -0.49 NA
-0.51 ` .97
Fit Thresholds
-0.04 -0.02 -0.02 0.13 0.24 0.24
1.2 -0.33
Mean Ability -0.82
NA -0.72 -0.68 NA
-0.6 -0.6
1.13 Fit Thresholds
-0.24 -0.24 -0.21 -0.11 -0.11 0.09
1.3 -0.18
Mean Ability -0.73
NA NA -0.59
NA NA
-0.52 0.99 Fit
Thresholds -0.24 -0.24 -0.24 -0.11 -0.11
-0.11 1.4
-0.02 Mean Ability
-0.76 -0.7
NA -0.63 -0.6
NA -0.57
1.06 Fit Thresholds
-0.27 -0.22 -0.22 -0.16 0.3
0.3 1.5
0.09 Mean Ability
-0.65 NA
NA -0.56 NA
NA -0.5
0.98 Fit Thresholds
-0.03 -0.03 -0.03 0.2
0.2 0.2
1.6 anchor
-0.67 Mean Ability
-0.67 NA -0.58 -0.58
NA -0.53 -0.54
0.99 Fit Thresholds
-0.52 -0.52 -0.49 -0.12 -0.12 0.08
1.7 -0.33
Mean Ability -0.75
NA -0.56 -0.59 NA
NA -0.56
1.07 Fit Thresholds
-0.41 -0.41 -0.4 -0.39 -0.39
-0.39
2. Skill to Presume DataInformation
2.1. 0.32
Mean Ability -0.8 -0.74 -0.64
-0.6 -0.59 NA
NA 1.04 Fit
Thresholds 0.07 0.12 0.54 0.57
2.2. -0.05
Mean Ability -0.72
NA NA -0.57
NA NA
-0.53 1 Fit
Thresholds -0.14 -0.14 -0.14 0.04 0.04
0.04 2.3
0.24 Mean Ability
-0.74 -0.61 -0.55 NA
NA NA
NA 0.98 Fit
Thresholds 0.19 0.28
2.4 -0.02
Mean Ability -0.77
NA NA -0.62
NA NA
-0.56 1.04 Fit
Thresholds -0.1
-0.1 -0.1 0.06 0.06
0.06 2.5
Mean Ability -0.74
NA -0.6 -0.58
NA -0.58 -0.53
1.07 Fit Thresholds
-0.23 -0.23 -0.22 -0.17 -0.17 1.17
2.6 -0.08
Mean Ability -0.7
NA NA -0.56
NA NA
-0.49 0.97 Fit
Thresholds -0.16 -0.16 -0.16
2.7 -0.46
Mean Ability -0.71
NA -0.6 -0.59
NA NA
-0.56 1.05 Fit
Thresholds -0.38 -0.38 -0.38 -0.37 -0.37
-0.37 2.8
0.46 Mean Ability
-0.77 -0.69 -0.63 -0.61 -0.54 -0.58 -0.55
1.03 Fit Thresholds
0.09 0.16 0.19 0.62 0.77 0.89
2.9 0.09
Mean Ability -0.68
NA NA -0.56
NA NA
-0.54 1 Fit
Thresholds -0.02 -0.02 -0.02 0.19 0.19
0.19
3. Skill to Folow Instruction
3.1 -0.28
Mean Ability -0.75
NA -0.61 -0.6
NA -0.51 -0.51
0.98 Fit Thresholds
-0.24 -0.24 -0.19 -0.08 -0.08 0.12
3.2 -0.06
Mean Ability -0.62
NA NA -0.54
NA NA
-0.49 0.96 Fit
Thresholds -0.17 -0.17 -0.17 0.05 0.05
0.05 3.3
0.09 Mean Ability
-0.76 NA
NA -0.6
NA NA
-0.53 1.02 Fit
Thresholds -0.02 -0.02 -0.02
0.2 0.2
0.2 3.4
-0.11 Mean Ability
-0.76 NA
NA -0.59 NA
NA -0.53
1.01 Fit Thresholds
-0.21 -0.21 -0.21 -0.02 -0.02 -0.02
31
Cont. Table 3. Testee average ability, item difficulty, and step threshold of each item, and the item fit test with the PCM model of seven categories politomus scaling
Item Number
Difficulty Aspect
Step Infit
MNSQ KET.
1 2
3 4
5 6
4. Classifying Skill
