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{{StatsPsy}}
 
{{StatsPsy}}
{{dablink|This article is about rectangular bar charts. For charts of market prices, see [[Open-high-low-close chart]].}}
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A '''bar chart''', also known as a '''bar graph''', is a [[chart]] with [[rectangle|rectangular]] bars of [[length]]s usually proportional to the magnitudes or frequencies of what they represent. Bar charts are used for comparing two or more values. The bars can be horizontally or vertically oriented. Sometimes a stretched graphic is used instead of a solid bar.
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A '''bar chart''', also known as a '''bar graph''', is a [[chart]] with rectangular bars of lengths usually proportional to the magnitudes or frequencies of what they represent. Bar charts are used for comparing two or more values. The bars can be horizontally or vertically oriented. Sometimes a stretched graphic is used instead of a solid bar.
   
 
==Example==
 
==Example==
   
The following example chart is based on the results of the [[European Parliament election, 2004|election for the European Parliament in 2004]] and in [[European Parliament election, 1999|1999]]. The following table lists the number of seats allocated to each party group. The results of [[1999]] have been multiplied by 1.16933, to compensate for the change in number of seats between those years.
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The following example chart is based on the results of the election for the European Parliament in 2004 and in 1999. The following table lists the number of seats allocated to each party group. The results of [[1999]] have been multiplied by 1.16933, to compensate for the change in number of seats between those years.
   
 
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Latest revision as of 09:55, March 4, 2007

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A bar chart, also known as a bar graph, is a chart with rectangular bars of lengths usually proportional to the magnitudes or frequencies of what they represent. Bar charts are used for comparing two or more values. The bars can be horizontally or vertically oriented. Sometimes a stretched graphic is used instead of a solid bar.

ExampleEdit

The following example chart is based on the results of the election for the European Parliament in 2004 and in 1999. The following table lists the number of seats allocated to each party group. The results of 1999 have been multiplied by 1.16933, to compensate for the change in number of seats between those years.

Group Seats (2004) Seats (1999) scaled
EUL 39 49
PES 200 210
EFA 42 56
EDD 15 19
ELDR 67 60
EPP 276 272
UEN 27 36
Other 66 29

A bar chart visualizing the above results of the 2004 election can look like this:
(If all the values were arranged in descending order this type of bar graph would be called a pareto chart.)

This bar chart shows both the results of 2004, and those of 1999:

HistoryEdit

The bar chart is possibly the invention of the Scots engineer and economist William Playfair (1759-1823). A bar chart was used in his work The Commercial and Political Atlas (London, 1786).

See alsoEdit

External links Edit

de:Balkendiagramm
is:Súlurit
nl:Staafdiagram
sv:Stapeldiagram
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