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A researcher conducts a study measuring participants' stress levels before and after a mindfulness workshop. When computing a difference score for each participant, the researcher subtracts the pretest score from the posttest score for the first 15 participants but then switches to subtracting the posttest score from the pretest score for the remaining 15 participants. This approach is acceptable because both subtraction directions are valid ways to compute difference scores.
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Research Methods in Psychology - 4th American Edition @ KPU
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A researcher conducts a study measuring participants' stress levels before and after a mindfulness workshop. When computing a difference score for each participant, the researcher subtracts the pretest score from the posttest score for the first 15 participants but then switches to subtracting the posttest score from the pretest score for the remaining 15 participants. This approach is acceptable because both subtraction directions are valid ways to compute difference scores.