This core textbook introduces psychology students to research methods. The author’s principal goal is to present methods in a way that will lend coherence to the material. He does this by providing a meaningful framework based around Campbell and Stanley’s "threats to validity" and by organizing the book around the phases of the research process. In addition, in his approach and via boxed features, the author encourages and models a process of critical thinking for students.

Specifying the Research Variables I: Operational Definition and Measurement

Specifying the research variables I: Operational definition and measurement
  • A Quick Guide to Chapter 3: Specifying the Research Variables I
  • Introduction to the Chapter
  • Measurement Scales
    • The Nominal Scale of Measurement
    • The Ordinal Scale of Measurement
    • The Interval Scale of Measurement
    • The Ratio Scale of Measurement
  • True Score Test Theory
  • Psychometric Criteria
    • Reliability Criteria
    • Validity Criteria
      • Face Validity
      • Content Validity
      • Criterion-Related Validity
      • Construct Validity
  • Review Questions and Exercise

A Quick Guide to Chapter 3: Specifying the Research Variables I

Operationalization is the indispensable process of defining the general constructs in a research hypotheses in terms of concrete measurement operations. This process creates the specific independent and dependent variables that are actually studied in research. Operationalization must be evaluated for construct validity, a judgment about the quality of the measurement operations employed.

Two general ...

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