Quantitative Psychology is arguably one of the oldest disciplines within the field of psychology and nearly all psychologists are exposed to quantitative psychology in some form. While textbooks in statistics, research methods, and psychological measurement exist none offer a unified treatment of quantitative psychology. The SAGE Handbook of Quantitative Methods in Psychology does just that. Each chapter covers a methodological topic with equal attention paid to established theory and the challenges facing methodologists as they address new research questions using that particular methodology. The reader will come away from each chapter with a greater understanding of the methodology being addressed as well as an understanding of the directions for future developments within that methodological area.

Classical Test Theory

Classical test theory


Psychological measurement is based on the responses of participants to stimuli that may have been presented by the psychologist or, when an observation study is done, may have occurred in a natural setting. In this chapter, we refer to process of obtaining the measurements as a test. Psychologists are well aware that, although responses to stimuli may reflect the processes she expected the stimuli to elicit, the responses often will also reflect processes she would have preferred not to elicit. Therefore individual differences in the observed measurements must be conceptualized as reflecting multiple sources of variance. A statistical theory of psychological measurement formalizes the idea that observed measurements reflect multiple sources of variance by using a statistical model for the ...

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