Editorial
Why Is the One-Group Pretest-Posttest Design Still Used?
Thomas R Knapp. Clin Nurs Res. 2016 Oct.
Abstract
The one-group pretest-posttest pre-experimental design has been widely criticized, yet continues to be used in some clinical nursing research studies. This editorial explains what is wrong with the design, suggests reasons for its continued use, and gives some recommendations regarding what can be done about it.
Keywords: causality; experimental design; graduate education.
© The Author(s) 2016.
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One of the most frequently used quasi-experimental research designs in which a single group of research participants or subjects is pretested, given some treatment or independent variable manipulation, then posttested. If the pretest and posttest scores differ significantly, then the difference may be attributed to the independent variable, but because the research design is not strictly experimental and there is no control group, this inference is uncertain, and the difference may be due to extraneous variables such as order effects or regression towards the mean. See also interrupted time-series design, non-equivalent groups design.
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