Published by the Foundation for Open Access Statistics Editors-in-chief: Bettina Grün, Torsten Hothorn, Edzer Pebesma, Achim Zeileis    ISSN 1548-7660; CODEN JSSOBK
Authors: William D. Dupont, W. Dale Plummer Jr.
Title: Density Distribution Sunflower Plots
Abstract: Density distribution sunflower plots are used to display high-density bivariate data. They are useful for data where a conventional scatter plot is difficult to read due to overstriking of the plot symbol. The x-y plane is subdivided into a lattice of regular hexagonal bins of width w specified by the user. The user also specifies the values of l, d, and k that affect the plot as follows. Individual observations are plotted when there are less than l observations per bin as in a conventional scatter plot. Each bin with from l to d observations contains a light sunflower. Other bins contain a dark sunflower. In a light sunflower each petal represents one observation. In a dark sunflower, each petal represents k observations. (A dark sunflower with p petals represents between /2-pk k and /2+pk k observations.) The user can control the sizes and colors of the sunflowers. By selecting appropriate colors and sizes for the light and dark sunflowers, plots can be obtained that give both the overall sense of the data density distribution as well as the number of data points in any given region. The use of this graphic is illustrated with data from the Framingham Heart Study. A documented Stata program, called sunflower, is available to draw these graphs. It can be downloaded from the Statistical Software Components archive at http://ideas.repec.org/c/boc/bocode/s430201.html . (Journal of Statistical Software 2003; 8 (3): 1-5. Posted at http://www.jstatsoft.org/index.php?vol=8 .)

Page views:: 13183. Submitted: 2002-03-07. Published: 2003-01-17.
Paper: Density Distribution Sunflower Plots     Download PDF (Downloads: 14851)
Supplements:
fig1.do.txt: fig1.do: Stata program that produces figure 1 from paper Download (Downloads: 1483; 683B)
fig2.do.txt: fig2.do: Stata program that produces figure 2 from paper Download (Downloads: 1436; 2KB)
summary.pdf: summary of paper Download (Downloads: 1358; 42KB)
sunflower.ado.txt: sunflower.ado: program define sunflower, rclass Download (Downloads: 1516; 26KB)
sunflower.hlp.txt: sunflower.hlp: draws density distribution sunflower plots Download (Downloads: 1632; 14KB)

DOI: 10.18637/jss.v008.i03

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Paper: Creative Commons Attribution 3.0 Unported License
Code: GNU General Public License (at least one of version 2 or version 3) or a GPL-compatible license.