Construct Validity: A Rasch Measurement Model Approaches

Abstract

Summary statistic for person. SUMMARY OF 123 MEASURED (NON-EXTREME Person TOT MODEL INFIT OUTFIT SCORE COUNT MEASURE ERROR MNSQ ZSTD MNSQ ZSTD MEAN 40.3 16.1 -0.30 0.08 0.74 -0.30 0.75 -0.20 S.D 62.2 0.7 0.15 0.05 0.44 0.90 0.42 0.70 MAX 481.0 19.0 -0.09 0.23 2.26 2.30 2.58 2.60 MIN 3.0 14.0 -0.81 0.01 0.11 -2.20 0.22 -1.40 REAL RMSE 0.09 TRUE SD 0.12 SEPARATION 1.26 Person RELIABTY .61 MODEL RMSE 0.09 TRUE SD 0.12 SEPARATION 1.28 Person RELIABTY .62 S.E. OF Person MEAN = .01 MINIMUM EXTREME SCORE: 2 Person Table II: Summary statistic for item. SUMMARY OF 19 MEASURED (NON-EXTREME Item TOT MODEL INFIT OUTFIT SCORE COUNT MEASURE ERROR MNSQ ZSTD MNSQ ZSTD MEAN 260.7 106.1 0.00 0.03 0.85 -0.40 0.72 -0.80 S.D 248.8 32.6 0.18 0.03 0.37 1.20 0.23 0.90 MAX 1005.0 125.0 0.43 0.15 1.88 2.40 1.31 0.80 MIN 8.0 34.0 -0.16 0.01 0.21 -2.90 0.42 -2.80 REAL RMSE 0.05 TRUE SD 0.17 SEPARATION 3.77 Person RELIABTY .93 MODEL RMSE 0.05 TRUE SD 0.17 SEPARATION 3.77 Person RELIABTY .93 S.E. OF Item MEAN = .04

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