Teaching:TUW - UE InfoVis WS 2008/09 - Gruppe 02 - Aufgabe 1 - Scatterplot: Difference between revisions
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A scatterplot (also called a ''scatter chart'', ''scatter diagram'' or ''scatter graph'' [Wikipedia]) is a diagram in which the values of two variables are applied to the horizontal and vertical axes of a cartesian coordinate system. The resulting point in the graph represents one record from a data set. The distribution pattern of points from multiple records | A scatterplot (also called a ''scatter chart'', ''scatter diagram'' or ''scatter graph'' [Wikipedia]) is a diagram in which the values of two variables are applied to the horizontal and vertical axes of a cartesian coordinate system. The resulting point in the graph represents one record from a data set. The distribution pattern of points from multiple records reveals the correlation among the selected variables in the data set. The scatterplot is not to be confused with the ''correlation plot'' [Information Technology Lab, NIST #2] which treats already adopted correlation coefficients in different data groups, while the term ''correlation diagram'' does not seem to be bound. | ||
=Revealed Information= | =Revealed Information= | ||
==Type of Correlation== | |||
correlation patterns -> type of correlation | correlation patterns -> type of correlation | ||
(regression | (regression function, "scatterplot smoothing" [NetMBA]) | ||
sign, strength (TODO: add about figures with: perfect positive, strong tight negative, weak loose positive, no correlation, clusters) | sign, strength (TODO: add about figures with: perfect positive, strong tight negative, weak loose positive, no correlation, clusters) | ||
==Density, Outlyers and Clusters== | |||
density (-> cluster analysis) & outlyers | density (-> cluster analysis) & outlyers | ||
=Scatterplots of | =Scatterplots of Higher Dimensions= | ||
Not necessarily two variables, higher dimensions displayed spacially or by point properties (color, size, shape) | Not necessarily two variables, higher dimensions displayed spacially or by point properties (color, size, shape) | ||
TODO: add figure with colored 3D plot, sunflower plot [addictedtor.free.fr], [York University], jitter plot | |||
=Treating Discrete Data= | =Treating Discrete Data= | ||
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*NetMBA: http://www.netmba.com/statistics/plot/scatter/ | *NetMBA: http://www.netmba.com/statistics/plot/scatter/ | ||
*ChartItNow: http://www.chartitnow.com/scatter%20diagram.html | *ChartItNow: http://www.chartitnow.com/scatter%20diagram.html | ||
*addictedtor.free.fr: http://addictedtor.free.fr/graphiques/graphcode.php?graph=59 | |||
*York University: http://www.math.yorku.ca/SCS/sasmac/sunplot.html | |||
Revision as of 18:37, 30 October 2008
A scatterplot (also called a scatter chart, scatter diagram or scatter graph [Wikipedia]) is a diagram in which the values of two variables are applied to the horizontal and vertical axes of a cartesian coordinate system. The resulting point in the graph represents one record from a data set. The distribution pattern of points from multiple records reveals the correlation among the selected variables in the data set. The scatterplot is not to be confused with the correlation plot [Information Technology Lab, NIST #2] which treats already adopted correlation coefficients in different data groups, while the term correlation diagram does not seem to be bound.
Revealed Information
Type of Correlation
correlation patterns -> type of correlation (regression function, "scatterplot smoothing" [NetMBA]) sign, strength (TODO: add about figures with: perfect positive, strong tight negative, weak loose positive, no correlation, clusters)
Density, Outlyers and Clusters
density (-> cluster analysis) & outlyers
Scatterplots of Higher Dimensions
Not necessarily two variables, higher dimensions displayed spacially or by point properties (color, size, shape)
TODO: add figure with colored 3D plot, sunflower plot [addictedtor.free.fr], [York University], jitter plot
Treating Discrete Data
[Wikipedia, DE]
References
- Wikipedia, EN: http://en.wikipedia.org/wiki/Scatterplot
- Wikipedia, DE: http://de.wikipedia.org/wiki/Streudiagramm
- University of Illinois: http://www.mste.uiuc.edu/courses/ci330ms/youtsey/scatterinfo.html
- Information Technology Lab, NIST #1: http://www.itl.nist.gov/div898/handbook/eda/section3/eda33q.htm
- Information Technology Lab, NIST #2: http://www.itl.nist.gov/div898/handbook/eda/section3/linecorr.htm
- NetMBA: http://www.netmba.com/statistics/plot/scatter/
- ChartItNow: http://www.chartitnow.com/scatter%20diagram.html
- addictedtor.free.fr: http://addictedtor.free.fr/graphiques/graphcode.php?graph=59
- York University: http://www.math.yorku.ca/SCS/sasmac/sunplot.html