Social Work Research and Evaluation by Elizabeth G. DePoy Stephen French Gilson

Author:Elizabeth G. DePoy, Stephen French Gilson [Elizabeth G. DePoy, Stephen French Gilson]
Language: eng
Format: epub
ISBN: 9781452259642
Barnesnoble:
Publisher: SAGE Publications
Published: 2016-07-21T00:00:00+00:00

Quasi-Experimental

Quasi-experimental studies contain two of the three true-experimental elements: control group and manipulation (Beyman, 2014). Because random assignment is absent in quasi-experimentation, causal claims may be made while acknowledging potential alternative explanations for findings, or causal inferences may simply be avoided if they are unjustified by the purpose, design, or practice context (DePoy & Gilson, 2009). As we have indicated throughout this book, in social work, true experimentation is often not feasible, ethical, or even relevant to the knowledge being sought. Therefore, within the experimental-type tradition, other design options are extremely useful in generating systematic social work knowing, even though the language of the experimental-type tradition implies that designs other than true-experimentation are “missing something.”

Two basic design types fit the criteria for quasi-experimentation: nonequivalent control group designs and time series approaches (Rubin & Babbie, 2016).

Nonequivalent control group designs contain at least two comparison groups, but subjects are not randomly assigned to these groups. Using Campbell and Stanley (1963), the basic design is structured as presented below:

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