Item Parameters with links to ICC/IIF

ID MEASURE COUNT SCORE PTME INMSQ INZSTD OUTMS OUTZSTD
I0001 -1.18 3166 2838 0.39 0.98 -0.54 0.85 -1.62
I0002 1.03 3166 1871 0.46 1.02 1.14 0.98 -0.61
I0003 -2.29 3166 3037 0.31 0.99 -0.17 1.19 1.25
I0004 -0.85 3166 2746 0.40 0.99 -0.38 0.87 -1.60
I0005 -0.10 3166 2464 0.36 1.11 4.17 1.13 2.33
I0006 -0.11 3166 2469 0.46 0.96 -1.53 0.86 -2.69
I0007 -0.15 3166 2488 0.40 1.05 1.90 0.97 -0.48
I0008 0.26 3166 2297 0.44 1.02 0.93 0.94 -1.28
I0009 -0.12 3166 2472 0.52 0.86 -5.89 0.75 -5.02
I0010 -0.69 3166 2695 0.44 0.93 -2.03 0.76 -3.48
I0011 0.80 3166 2008 0.48 0.99 -0.47 0.93 -2.22
I0012 -0.57 3166 2652 0.42 0.97 -1.11 0.90 -1.43
I0013 0.77 3166 2024 0.41 1.09 4.86 1.07 2.06
I0014 -0.17 3166 2494 0.47 0.94 -2.35 0.77 -4.33
I0015 0.11 3166 2369 0.48 0.93 -3.32 0.87 -2.72
I0016 1.55 3166 1563 0.45 1.04 2.45 1.06 2.31
I0017 0.95 3166 1917 0.47 1.00 0.02 0.96 -1.26
I0018 -0.42 3166 2595 0.43 0.99 -0.47 0.87 -2.00
I0019 0.18 3166 2335 0.31 1.20 8.45 1.37 7.05
I0020 -0.13 3166 2478 0.43 0.99 -0.34 0.91 -1.67
I0021 1.17 3166 1792 0.41 1.10 5.89 1.09 3.14
I0022 -0.34 3166 2567 0.45 0.96 -1.36 0.84 -2.70
I0023 0.02 3166 2410 0.42 1.03 1.24 1.03 0.50
I0024 -1.09 3166 2815 0.44 0.90 -2.54 0.66 -4.03
I0025 -0.27 3166 2539 0.48 0.90 -3.68 0.76 -4.32
I0026 -0.56 3166 2648 0.47 0.90 -3.29 0.74 -4.05
I0027 -0.26 3166 2533 0.48 0.91 -3.31 0.77 -4.07
I0028 0.04 3166 2401 0.43 1.00 0.08 1.00 -0.03
I0029 0.99 3166 1898 0.35 1.18 9.90 1.29 8.62
I0030 -0.26 3166 2532 0.48 0.92 -3.25 0.79 -3.79
I0031 2.62 3166 952 0.28 1.25 9.90 1.53 9.90
I0032 1.33 3166 1694 0.25 1.36 9.90 1.55 9.90
I0033 1.04 3166 1866 0.45 1.03 1.99 1.05 1.55
I0034 -0.60 3166 2662 0.47 0.90 -3.30 0.75 -3.84
I0035 -1.20 3166 2843 0.41 0.92 -1.92 0.82 -1.84
I0036 -0.72 3166 2703 0.49 0.86 -4.44 0.61 -5.87
I0037 -0.73 3166 2708 0.47 0.86 -4.43 0.97 -0.41
I0038 -0.66 3166 2685 0.49 0.85 -4.90 0.65 -5.28
I0039 -1.39 3166 2890 0.40 0.92 -1.65 0.76 -2.32
I0040 1.12 3166 1819 0.43 1.06 3.67 1.08 2.70
I0041 -0.03 3166 2432 0.49 0.93 -3.13 0.78 -4.56
I0042 0.03 3166 2407 0.40 1.06 2.31 1.05 1.05
I0043 0.09 3166 2376 0.46 0.97 -1.30 0.88 -2.49
I0044 1.54 3166 1566 0.43 1.06 3.75 1.11 4.05
I0045 0.79 3166 2009 0.47 1.00 0.09 0.98 -0.65
I0046 0.24 3166 2303 0.47 0.97 -1.51 0.88 -2.81
I0047 0.51 3166 2167 0.50 0.94 -3.02 0.85 -4.13
I0048 0.03 3166 2408 0.47 0.94 -2.45 0.86 -2.95
I0049 -0.38 3166 2581 0.42 1.00 0.04 0.91 -1.45
I0050 -0.86 3166 2750 0.44 0.90 -2.75 0.79 -2.63
I0051 0.14 3166 2353 0.42 1.02 1.00 1.04 0.84
I0052 -1.46 3166 2905 0.43 0.88 -2.53 0.60 -4.11
I0053 -1.06 3166 2807 0.41 0.93 -1.90 0.88 -1.31
I0054 0.78 3166 2016 0.47 0.99 -0.32 0.99 -0.28
I0055 0.51 3166 2167 0.28 1.26 9.90 1.45 9.90


Test Information Function and Test Characteristic Curve

skill_level: 5 tcc: 54.4 skill_level: 4 tcc: 53.6 skill_level: 3 tcc: 51.4 skill_level: 2 tcc: 46.8 skill_level: 1 tcc: 38.8 skill_level: 0 tcc: 27.6 skill_level: -1 tcc: 16.4 skill_level: 0 tif: 11.8 skill_level: -1 tif: 10.1 skill_level: 1 tif: 9.9 skill_level: -2 tcc: 8.1 skill_level: -2 tif: 6.32 skill_level: 2 tif: 6.21 skill_level: -3 tcc: 3.5 skill_level: 3 tif: 3.13 skill_level: -3 tif: 3.11 skill_level: 4 tif: 1.36 skill_level: -4 tcc: 1.39 skill_level: 5 tif: 0.54 skill_level: -5 tcc: 0.527
Plot of tcc * skill_level


Overview of item difficulty: below -0.5=very easy, above 0.5 = very hard, else = average

itemid: I0001 MEASURE: -1.18 difficulty: Easy itemid: I0002 MEASURE: 1.03 difficulty: Hard itemid: I0003 MEASURE: -2.29 difficulty: Easy itemid: I0004 MEASURE: -0.85 difficulty: Easy itemid: I0005 MEASURE: -0.1 difficulty: Average itemid: I0006 MEASURE: -0.11 difficulty: Average itemid: I0007 MEASURE: -0.15 difficulty: Average itemid: I0008 MEASURE: 0.26 difficulty: Average itemid: I0009 MEASURE: -0.12 difficulty: Average itemid: I0010 MEASURE: -0.69 difficulty: Easy itemid: I0011 MEASURE: 0.8 difficulty: Hard itemid: I0012 MEASURE: -0.57 difficulty: Easy itemid: I0013 MEASURE: 0.77 difficulty: Hard itemid: I0014 MEASURE: -0.17 difficulty: Average itemid: I0015 MEASURE: 0.11 difficulty: Average itemid: I0016 MEASURE: 1.55 difficulty: Hard itemid: I0017 MEASURE: 0.95 difficulty: Hard itemid: I0018 MEASURE: -0.42 difficulty: Average itemid: I0019 MEASURE: 0.18 difficulty: Average itemid: I0020 MEASURE: -0.13 difficulty: Average itemid: I0021 MEASURE: 1.17 difficulty: Hard itemid: I0022 MEASURE: -0.34 difficulty: Average itemid: I0022 MEASURE: -0.34 difficulty: Average itemid: I0023 MEASURE: 0.02 difficulty: Average itemid: I0024 MEASURE: -1.09 difficulty: Easy itemid: I0025 MEASURE: -0.27 difficulty: Average itemid: I0026 MEASURE: -0.56 difficulty: Easy itemid: I0027 MEASURE: -0.26 difficulty: Average itemid: I0028 MEASURE: 0.04 difficulty: Average itemid: I0029 MEASURE: 0.99 difficulty: Hard itemid: I0030 MEASURE: -0.26 difficulty: Average itemid: I0031 MEASURE: 2.62 difficulty: Hard itemid: I0032 MEASURE: 1.33 difficulty: Hard itemid: I0033 MEASURE: 1.04 difficulty: Hard itemid: I0034 MEASURE: -0.6 difficulty: Easy itemid: I0035 MEASURE: -1.2 difficulty: Easy itemid: I0036 MEASURE: -0.72 difficulty: Easy itemid: I0037 MEASURE: -0.73 difficulty: Easy itemid: I0038 MEASURE: -0.66 difficulty: Easy itemid: I0039 MEASURE: -1.39 difficulty: Easy itemid: I0040 MEASURE: 1.12 difficulty: Hard itemid: I0041 MEASURE: -0.03 difficulty: Average itemid: I0042 MEASURE: 0.03 difficulty: Average itemid: I0043 MEASURE: 0.09 difficulty: Average itemid: I0044 MEASURE: 1.54 difficulty: Hard itemid: I0045 MEASURE: 0.79 difficulty: Hard itemid: I0046 MEASURE: 0.24 difficulty: Average itemid: I0047 MEASURE: 0.51 difficulty: Hard itemid: I0048 MEASURE: 0.03 difficulty: Average itemid: I0049 MEASURE: -0.38 difficulty: Average itemid: I0050 MEASURE: -0.86 difficulty: Easy itemid: I0051 MEASURE: 0.14 difficulty: Average itemid: I0052 MEASURE: -1.46 difficulty: Easy itemid: I0053 MEASURE: -1.06 difficulty: Easy itemid: I0054 MEASURE: 0.78 difficulty: Hard itemid: I0054 MEASURE: 0.78 difficulty: Hard itemid: I0055 MEASURE: 0.51 difficulty: Hard
HBAR chart of itemid


Diagnosis of item-total correlation (Negative is bad, below .3 is low)

itemid: I0001 PTME: 0.39 correlation: Fine itemid: I0002 PTME: 0.46 correlation: Fine itemid: I0003 PTME: 0.31 correlation: Fine itemid: I0004 PTME: 0.4 correlation: Fine itemid: I0005 PTME: 0.36 correlation: Fine itemid: I0006 PTME: 0.46 correlation: Fine itemid: I0007 PTME: 0.4 correlation: Fine itemid: I0008 PTME: 0.44 correlation: Fine itemid: I0009 PTME: 0.52 correlation: Fine itemid: I0010 PTME: 0.44 correlation: Fine itemid: I0011 PTME: 0.48 correlation: Fine itemid: I0012 PTME: 0.42 correlation: Fine itemid: I0013 PTME: 0.41 correlation: Fine itemid: I0014 PTME: 0.47 correlation: Fine itemid: I0015 PTME: 0.48 correlation: Fine itemid: I0016 PTME: 0.45 correlation: Fine itemid: I0017 PTME: 0.47 correlation: Fine itemid: I0018 PTME: 0.43 correlation: Fine itemid: I0019 PTME: 0.31 correlation: Fine itemid: I0020 PTME: 0.43 correlation: Fine itemid: I0021 PTME: 0.41 correlation: Fine itemid: I0022 PTME: 0.45 correlation: Fine itemid: I0022 PTME: 0.45 correlation: Fine itemid: I0023 PTME: 0.42 correlation: Fine itemid: I0024 PTME: 0.44 correlation: Fine itemid: I0025 PTME: 0.48 correlation: Fine itemid: I0026 PTME: 0.47 correlation: Fine itemid: I0027 PTME: 0.48 correlation: Fine itemid: I0028 PTME: 0.43 correlation: Fine itemid: I0029 PTME: 0.35 correlation: Fine itemid: I0030 PTME: 0.48 correlation: Fine itemid: I0031 PTME: 0.28 correlation: Low itemid: I0032 PTME: 0.25 correlation: Low itemid: I0033 PTME: 0.45 correlation: Fine itemid: I0034 PTME: 0.47 correlation: Fine itemid: I0035 PTME: 0.41 correlation: Fine itemid: I0036 PTME: 0.49 correlation: Fine itemid: I0037 PTME: 0.47 correlation: Fine itemid: I0038 PTME: 0.49 correlation: Fine itemid: I0039 PTME: 0.4 correlation: Fine itemid: I0040 PTME: 0.43 correlation: Fine itemid: I0041 PTME: 0.49 correlation: Fine itemid: I0042 PTME: 0.4 correlation: Fine itemid: I0043 PTME: 0.46 correlation: Fine itemid: I0044 PTME: 0.43 correlation: Fine itemid: I0045 PTME: 0.47 correlation: Fine itemid: I0046 PTME: 0.47 correlation: Fine itemid: I0047 PTME: 0.5 correlation: Fine itemid: I0048 PTME: 0.47 correlation: Fine itemid: I0049 PTME: 0.42 correlation: Fine itemid: I0050 PTME: 0.44 correlation: Fine itemid: I0051 PTME: 0.42 correlation: Fine itemid: I0052 PTME: 0.43 correlation: Fine itemid: I0053 PTME: 0.41 correlation: Fine itemid: I0054 PTME: 0.47 correlation: Fine itemid: I0054 PTME: 0.47 correlation: Fine itemid: I0055 PTME: 0.28 correlation: Low
HBAR chart of itemid


Detection of misfit items (Outfit Mean squares > 1.5 is bad)

itemid: I0001 OUTMS: 0.85 fitness: Fit itemid: I0002 OUTMS: 0.98 fitness: Fit itemid: I0003 OUTMS: 1.19 fitness: Fit itemid: I0004 OUTMS: 0.87 fitness: Fit itemid: I0005 OUTMS: 1.13 fitness: Fit itemid: I0006 OUTMS: 0.86 fitness: Fit itemid: I0007 OUTMS: 0.97 fitness: Fit itemid: I0008 OUTMS: 0.94 fitness: Fit itemid: I0009 OUTMS: 0.75 fitness: Fit itemid: I0010 OUTMS: 0.76 fitness: Fit itemid: I0011 OUTMS: 0.93 fitness: Fit itemid: I0012 OUTMS: 0.9 fitness: Fit itemid: I0013 OUTMS: 1.07 fitness: Fit itemid: I0014 OUTMS: 0.77 fitness: Fit itemid: I0015 OUTMS: 0.87 fitness: Fit itemid: I0016 OUTMS: 1.06 fitness: Fit itemid: I0017 OUTMS: 0.96 fitness: Fit itemid: I0018 OUTMS: 0.87 fitness: Fit itemid: I0019 OUTMS: 1.37 fitness: Fit itemid: I0020 OUTMS: 0.91 fitness: Fit itemid: I0021 OUTMS: 1.09 fitness: Fit itemid: I0022 OUTMS: 0.84 fitness: Fit itemid: I0022 OUTMS: 0.84 fitness: Fit itemid: I0023 OUTMS: 1.03 fitness: Fit itemid: I0024 OUTMS: 0.66 fitness: Fit itemid: I0025 OUTMS: 0.76 fitness: Fit itemid: I0026 OUTMS: 0.74 fitness: Fit itemid: I0027 OUTMS: 0.77 fitness: Fit itemid: I0028 OUTMS: 1 fitness: Fit itemid: I0029 OUTMS: 1.29 fitness: Fit itemid: I0030 OUTMS: 0.79 fitness: Fit itemid: I0031 OUTMS: 1.53 fitness: Misfit itemid: I0032 OUTMS: 1.55 fitness: Misfit itemid: I0033 OUTMS: 1.05 fitness: Fit itemid: I0034 OUTMS: 0.75 fitness: Fit itemid: I0035 OUTMS: 0.82 fitness: Fit itemid: I0036 OUTMS: 0.61 fitness: Fit itemid: I0037 OUTMS: 0.97 fitness: Fit itemid: I0038 OUTMS: 0.65 fitness: Fit itemid: I0039 OUTMS: 0.76 fitness: Fit itemid: I0040 OUTMS: 1.08 fitness: Fit itemid: I0041 OUTMS: 0.78 fitness: Fit itemid: I0042 OUTMS: 1.05 fitness: Fit itemid: I0043 OUTMS: 0.88 fitness: Fit itemid: I0044 OUTMS: 1.11 fitness: Fit itemid: I0045 OUTMS: 0.98 fitness: Fit itemid: I0046 OUTMS: 0.88 fitness: Fit itemid: I0047 OUTMS: 0.85 fitness: Fit itemid: I0048 OUTMS: 0.86 fitness: Fit itemid: I0049 OUTMS: 0.91 fitness: Fit itemid: I0050 OUTMS: 0.79 fitness: Fit itemid: I0051 OUTMS: 1.04 fitness: Fit itemid: I0052 OUTMS: 0.6 fitness: Fit itemid: I0053 OUTMS: 0.88 fitness: Fit itemid: I0054 OUTMS: 0.99 fitness: Fit itemid: I0054 OUTMS: 0.99 fitness: Fit itemid: I0055 OUTMS: 1.45 fitness: Fit
HBAR chart of itemid