Statistical power and within-subjects designs
Within-subjects research designs increase statistical power and decrease the needed sample size
Within-subjects designs are the most powerful type of research design because each participant serves as their own control. Multiple observations of the outcome can be taken as well to understand longitudinal effects. There is always a drastic decrease in the needed sample size when using within-subjects designs. Both large and small effect sizes are easier to detect when using within-subjects designs.
Within-subjects designs increase statistical power and decrease the needed sample size.
Click on the Power and Effect Size button to continue.
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