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Units of Analysis, Measurement Scales, and Statistics: A Comment on Kerwin and Shaffer

Ball State University, 00BEWhitley{at}BSUVAX1.BITNET

Kirwin and Shaffer recently conducted a study examining the role of dogmatism as a possible moderator of the relationship between judge's instructions and mockjury decisions. The study was defwient in that it inappropriately applied an individuallevel construct (dogmatism) to groups; used incorrect scaling procedures and an inappropriate statistical analysis, leading to incorrect conclusions; and used aggregate data to draw conclusions concerning individual behavior, thereby losing information available in the data. Implications of these problems for research design are discussed.

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