Transcription of Chapter 3 Psychometrics: Reliability & Validity
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Chapter 3 Psychometrics: Reliability & Validity
Chapter 3 Psychometrics: Reliability & Validity 45 Measuring Learning & Performance: A Primer | Retrieved from Chapter 3 Psychometrics: Reliability & Validity The purpose of classroom assessment in a physical, virtual, or blended classroom is to measure ( , scale and classify) examinees knowledge, skills, and/or attitudes. For example in achievement testing, one measures, using points, how much knowledge a learner possesses (called scaling) and then his or her total raw point score equates to a grade, , A, B, C, etc. (called classifying). In this Chapter , we will consider essential attributes of any measuring device: Reliability and Validity . Classical Reliability indices ( , test-retest [stability], parallel forms [equivalence], internal consistency, and inter-rater) are most routinely used in classroom assessment and are hence, discussed.
The reliability coefficient will be high, if the observers rated similarly. For example, three senior sales trainers rating the closing skills of a novice sales representative or master teachers rating the teaching effectiveness of a first or second year teacher should agree in their ratings. B. The Theoretical Basis for Classical Reliability ...
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