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.

Quasi-Experimental Design

Quasi-experimental design


Estimating the effect of a treatment or intervention is a common task in psychological research. For example, estimating the effect of a treatment or intervention is common in both basic and applied researchin psychology, as well as in the other social sciences. The purpose most often in basic research is to test theories. A theory is put to the test by deriving its empirical implications and seeing if they hold true. In many cases, a theory's most telling implications entail predictions about the effects of treatments or interventions. In contrast, the immediate concern in applied research is improving the human condition, with less concern for theoretical implications. Nonetheless, estimating effects is still of great importance in applied research because of the need to ...

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