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Advantages of within within-subjects designs
-need fewer Ps (more efficient)
-can study change over time
-reduces random variation
-no confounds with individual differences
you deteriorate in your performance over time, if you make someone do it over and over again they will get tired and worn out
effects from previous treatments may still be present when presenting new treatment (drug trials)
-include all possible orders of conditions
-Ps can either go to condition A,B,C, or D
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