Measurement

Measurement

1. the act of measuring, which involves identifying the dimensions, quantity, capacity, or degree of something.

2. scales

   • nominal, ordinal, interval, and ratio
     • nominal
       • uses symbols, such as words or numbers, to label, classify, or identify people or objects.
     • ordinal
       • rank-order scale
     • Interval
       • includes the rank-order feature of ordinal scales, with the additional characteristic of equal distances, or equal intervals, between adjacent numbers on the scale.
     • Ratio
       • includes the properties of ordinal (rank order) and interval (equal distances between points) scales, plus it has a true zero point.

3. Reliability

   • consistency or stability of a set of test scores.
   • Reliability coefficient

4. validity

   • the accuracy of the inferences or interpretations made by an observer from the test scores.
   • validity evidence
     • empirical evidence and theoretical rationales that support the interpretations and actions that taken on the basis of the score(s) obtained from an assessment procedure.
   • validation
     • inquiry process of gathering validity evidence that supports score interpretations or inferences.

5. Four types of measurement

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