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By the end of this chapter, you should be able to: understand the key differences between psychometric and non-psychometric. measures. understand the theoretical underpinnings of psychological measurement, and. compare and contrast Classical Test Theory with Item Response Theory.
A case study is: “a strategy for doing research which involves an empirical investigation of a particular contemporary phenomenon within its real-life context using multiple sources of evidence” (Robson, ‘Real World Research’, Blackwell, 1993).
- What Is Measurement?
- Psychological Constructs
- Operational Definitions
- Levels of Measurement
Measurement is the assignment of scores to individuals so that the scores represent some characteristic of the individuals. This very general definition is consistent with the kinds of measurement that everyone is familiar with—for example, weighing oneself by stepping onto a bathroom scale, or checking the internal temperature of a roasting turkey...
Many variables studied by psychologists are straightforward and simple to measure. These include sex, age, height, weight, and birth order. You can often tell whether someone is male or female just by looking. You can ask people how old they are and be reasonably sure that they know and will tell you. Although people might not know or want to tell ...
An operational definition is a definition of a variable in terms of precisely how it is to be measured. These measures generally fall into one of three broad categories. Self-report measures are those in which participants report on their own thoughts, feelings, and actions, as with the Rosenberg Self-Esteem Scale. Behavioural measures are those in...
The psychologist S. S. Stevens suggested that scores can be assigned to individuals in a way that communicates more or less quantitative information about the variable of interest (Stevens, 1946). For example, the officials at a 100-m race could simply rank order the runners as they crossed the finish line (first, second, etc.), or they could time ...
- Paul C. Price, Rajiv S. Jhangiani, I-Chant A. Chiang, Dana C. Leighton, Carrie Cuttler
- 2015
However, the term describes two types of qualifications: (a) generic assessment knowledge and skills neces-sary for typical uses of tests and (b) specific qualification for the responsible use of tests in specific settings and for specific purposes (APA, 2001).
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May 12, 2013 · In the third part of the paper, we propose a novel framework that may integrate the multifaceted with a one-dimensional view of valence by suggesting that valence should be conceived at different levels, micro and macro.
Jan 1, 2014 · A rating scale consists of a number of ordered categorical recordings of an item. The verbal descriptive scale (VDS), also called the verbal rating scale , consists of a discrete number of verbally described ordered response categories, or description of criteria, grading the level of responses.
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Dec 20, 2018 · Together with recoding scale categories into numbers, this introduces a twofold break in the traceability of rating data, compromising interpretability of findings. These insights question common reliability and validity concepts for ratings and provide novel explanations for replicability problems.
