An Adjusted Boxplot for Skewed Distributions (2006)
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BibTeX
@MISC{Hubert06anadjusted,
author = {Mia Hubert and Ellen Vandervieren},
title = {An Adjusted Boxplot for Skewed Distributions},
year = {2006}
}
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Abstract
The boxplot is a very popular graphical tool to visualize the distribution of con-tinuous unimodal data. It shows information about the location, spread, skewness as well as the tails of the data. However, since the fences are derived from the normal distribution, usually too many points are classified as outliers when the data are skewed. We present an adjustment of the boxplot that includes a robust measure of skewness in the determination of the whiskers. We show with several examples and simulation results that this adjusted boxplot gives a more accurate representation of the data and of possible outliers.
