In a repeated measures design the difference scores are used in the analysis, not the raw scores.

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In a repeated measures design, the same group of participants is measured multiple times under different conditions. The difference scores are calculated by subtracting the score in one condition from the score in another condition for each participant. The difference scores are then used in the analysis, not the raw scores. This is because the repeated measures design controls for individual differences in the participants, and the focus is on the change within each participant across conditions.

In a Repeated Measures Design the Difference Scores Are Used