Article1989

Observations are always ordinal; measurements, however, must be interval.

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Psychometric Methodologies and Testing Educational Assessment and Pedagogy Reliability and Agreement in Measurement

Abstract

Quantitative observations are based on counting observed events or levels of performance. Meaningful measurement is based on the arithmetical properties of interval scales. The Rasch measurement model provides the necessary and sufficient means to transform ordinal counts into linear measures. Imperfect unidimensionality and other threats to linear measurement can be assessed by means of fit statistics. The Rasch model is being successfully applied to rating scales.

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References

1982Rating scale analysis

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