A graphical method for selecting a symmetrizing power-law transformation is presented. The nonparametric procedure is simple, fast, and sufficiently precise for many practical purposes. It deals effectively with outliers, avoids the use of approximations, and provides a graphical perspective on different approaches to symmetrizing data. The method is suitable for exploratory data analysis, with its emphasis on rapid and instructive examination of data sets.
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Hines et al. (1987) studied this question.
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