Experimental Research Designs

Jones & Bartlett Learning, LLC. NOT FOR SALE OR DISTRIBUTION. 5. C HAPTER. Experimental Research Designs If there is an ideal against which all quantitative Designs are compared, it is the true experiment. In health-related Research , including studies of screening tests, diagnostics, prevention, and therapeutic interventions (DeMets & Fisher, 2008), this takes the form of the randomized clinical trial (RCT). There are many instances, however, in which employ- ing the Experimental design is difficult or impossible, premature, or unethical. For this reason, there are a variety of what are called quasi- Experimental Designs , as well as descriptive and observational Designs . The Experimental and quasi- Experimental Designs , along with their strengths and drawbacks, are discussed in this chapter.

selected for the experimental treatment group and the comparison or no- treatment group. For example, people who are eager to exercise are easier to recruit for an exercise study, especially for the intervention group, than are people who do not want to exercise. 7. Experimental mortality: Differences may occur in the loss of subjects in the treat-

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