Teaching:TUW - UE InfoVis WS 2007/08 - Gruppe 07 - Aufgabe 1 - Histogram: Difference between revisions
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| || ||<b>Σ 600</b> || <b>Σ 1,00</b> || | | || ||<b>Σ 600</b> || <b>Σ 1,00</b> || | ||
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Da die Fläche einer Säule gleich der Häufigkeit n<sub>j</sub> ist, errechnet sich die Höhe der Säule h<sub>j</sub> als | |||
:<math>h_j = \frac {n_j}{d_j}</math> | |||
mit d<sub>j</sub> als Klassenbreite. | |||
= Related Links = | = Related Links = |
Revision as of 17:57, 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]
Example
Frequency Table (Salary of Employees):
class j | Salary x i | absolute frequency n j | relative frequency | class width d 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 |
Da die Fläche einer Säule gleich der Häufigkeit nj ist, errechnet sich die Höhe der Säule hj als
- <math>h_j = \frac {n_j}{d_j}</math>
mit dj als Klassenbreite.
Related Links
References
- [Wikipedia, 2007] Wikipedia, Histogram. Retrieved at: November 01, 2007. http://en.wikipedia.org/wiki/Histogram