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difference score
difference score A difference score is the value obtained by subtracting one measurement from another, so the analysis focuses on the change or discrepancy between them.
A difference score is the value obtained by subtracting one measurement from another, so the analysis focuses on the change or discrepancy between them. In correlated or repeated-measures data, these scores are treated as a variable of their own and can be tested against zero or summarized by their mean and standard deviation.