Abstract
This paper was written as a belated response to an invitation by Campbell to debate the subject of regression artifacts and related topics on which we apparently differed. The thesis is that there appears to be a certain tendency in social science and program evaluation to adhere to some methodological practices by force of custom or habit rather than because of their reasoned applicability. These include the ideas of regression artifacts, random measurement error, and change or gain scores. A defense of this position in regard to all three ideas is presented.
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