Teaching:TUW - UE InfoVis WS 2007/08 - Gruppe 07 - Aufgabe 1 - Histogram: Difference between revisions

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<b>Frequency density</b> (height of a column): <br />
Frequency density (height of the column): <br />
n <sub> j </sub> / w <sub> j </sub>
n <sub> j </sub> / w <sub> j </sub>


Revision as of 18:13, 1 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]


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Example

Frequency Table (Salary of Employees):

class j Salary x i absolute frequency n j relative frequency class width w j
1 800 ≤ x < 1000 150 0,25 200
2 1000 < x < 2000 150 0,25 1000
3 2000 ≤ x ≤ 3500 300 0,50 1500
Σ 600 Σ 1,00


Frequency density (height of a column):
n j / w j

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References

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