Teaching:TUW - UE InfoVis WS 2007/08 - Gruppe 07 - Aufgabe 1 - Histogram: Difference between revisions
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<b>Frequency Table</b> | <b>Frequency Table</b> | ||
<table style="height:16px" border="1"> | <table style="height:16px" border="1"> | ||
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<td>[[image:histogram_sample.jpg|thumb|200px|right|Histogram Illustration]]</td> | |||
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<th>class j</th> | <th>class j</th> | ||
<th>absolute frequency n<sub>j</sub></th> | <th>absolute frequency n<sub>j</sub></th> | ||
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<td>36</td> | <td>36</td> | ||
<td>3</td> | <td>3</td> | ||
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<td>5</td> | <td>5</td> | ||
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Revision as of 13:00, 2 November 2007
Definitions
In statistics, a histogram is a graphical display of tabulated frequencies. A histogram is the graphical version of a table that shows what proportion of cases fall into each of several or many specified categories. The histogram differs from a bar chart in that it is the area of the bar that denotes the value, not the height, a crucial distinction when the categories are not of uniform width (Lancaster, 1974). The categories are usually specified as non-overlapping intervals of some variable. The categories (bars) must be adjacent.
[Wikipedia, 2007]
A histogram is used when we want to show frequencies of a continous variable. The continous variable can, of course, assume all values within an interval and the histogram reflects this by covering the whole of the interval concerned.
[Wallgreen et al., 1996]
Example
Frequency Table
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Frequency density (height of a column) = n j / w j
Related Links
References
- [Wikipedia, 2007] Wikipedia, Histogram. Retrieved at: November 01, 2007. http://en.wikipedia.org/wiki/Histogram
- [Wallgreen et al., 1996] Anders Wallgreen, Britt Wallgreen, Rolf Persson, Ulf Jorner and Jan-Aage Haaland. Graphing Statistics & Data: Creating Better Charts. SAGE Publications, Thousand Oaks, London, New Delhi, 1996.