Evidence-Based Practice / Unit 6 EBP 0780 short lesson, about 20 seconds
One-Group Designs
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The idea
Some designs evaluate one group's outcomes either before and after an intervention, or only after it.
In practice
A single unit measured before a change and again afterwards.
Where people slip
These offer no more confidence about cause and effect than nonexperimental studies, because of the bias inherent in having nothing to compare against.
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