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Advantage of Interrupted Time-Series Over Pretest-Posttest Designs
A primary advantage of the interrupted time-series design over a simpler one-group pretest-posttest design is its ability to account for normal, ongoing fluctuations in the dependent variable. By collecting multiple measurements both before and after an intervention, researchers can establish a baseline trend. This prevents them from falsely attributing a change to the treatment when it might simply be normal week-to-week variation, a crucial distinction that a single pretest and posttest measurement cannot reliably detect.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of an Interrupted Time-Series Design: Student Absences
Interrupted Time-Series Design with Nonequivalent Groups
AB Design
Advantage of Interrupted Time-Series Over Pretest-Posttest Designs
Which of the following procedures is the defining characteristic of an interrupted time-series design?
Learn After
Example of an Interrupted Time-Series Design: Student Absences
What is a primary advantage of the interrupted time-series design over a simple one-group pretest-posttest design?
A researcher measures student anxiety once before introducing a new study-skills workshop and once after. She observes a decrease in anxiety and concludes the workshop was effective. However, if anxiety levels naturally rise and fall from week to week, her conclusion may be unwarranted because a single pre- and post-measurement cannot distinguish a genuine treatment effect from ordinary fluctuations in the outcome variable.