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Tukey's Bulging Rule:
 Why Use It, and What to Do When It Fails
Bruce Ratner, Ph.D.

"A very effective and simple technique for straightening data is re-expressing the variables, which uses Turkey’s Ladder of Powers and the Bulging Rule. I present the details of the technique (as found in Ratner, B., Statistical Modeling and Analysis for Database Marketing: Effective Techniques for Mining Big Data, pages 39 - 41), CRC Press, Boca Raton, 2006) Then, I discuss:
  1. Why use Tukey's Bulging Rule; namely, the importance of straight-line relationships or straight data.
  2. When Tukey’s Bulging Rules fails; namely, which data conditions are not met.
  3. What to do when Tukey's Bulging Rule fails to straighten the data; namely, I offer a (nonstatistical) data mining method that has no data conditions to satisfy. 

Related Articles:
1. The Correlation Coefficient: Definition
2. Data Mining and Its Applications

For more information about this article, call Bruce Ratner at 516.791.3544,
1 800 DM STAT-1, or e-mail at