Definition

pie graph (or pie chart)

Part of the Computing fundamentals glossary:

Compare with histogram.

A pie graph (or pie chart) is a specialized graph used in statistics. The independent variable is plotted around a circle in either a clockwise direction or a counterclockwise direction.The dependent variable (usually a percentage) is rendered as an arc whose measure is proportional to the magnitude of the quantity.Each arc is depicted by constructing radial lines from its ends to the center of the circle, creating a wedge-shaped "slice."The independent variable can attain a finite number of discrete values (for example, five).The dependent variable can attain any value from zero to 100 percent.

The illustration is a pie graph depicting the results of a final exam given to a hypothetical class of students.Each grade is denoted by a "slice."The total of the percentages is equal to 100 (this is important; if it were not, the accuracy of the graph would be suspect).The total of the arc measures is equal to 360 degrees.

pie_graph.gif  (2552 bytes)

From this graph, one might gather that the professor for this course was not especially lenient nor severe.It is evident that grading was not done on a "pure curve" (in which case all the arcs would have equal measures of 72 degrees, corresponding to 20%).If this graph were compared with those of classes from other years that received the same test from the same professor, some conclusions might be drawn about intelligence changes among students over the years.If this graph were compared with those of other classes in the same semester who had received the same final exam but who had taken the course from different professors, one might draw conclusions about the relative competence and/or grading whims of the professors.

This was last updated in March 2011
Posted by: Margaret Rouse

Related Terms

Definitions

  • cryptography

    - Cryptography is a method of storing and transmitting data in a particular form so that only those for whom it is intended can read and process it. The term is most often associated with scrambling ... (SearchSoftwareQuality.com)

  • cache memory

    - Definition: Learn what cache memory is, what it has to do with RAM, how it is categorized and how it is configured. (SearchStorage.com)

  • raster graphics

    - Raster graphics are digital images created or captured (for example, by scanning in a photo) as a set of samples of a given space. (WhatIs.com)

Glossaries

  • Computing fundamentals

    - Terms related to computer fundamentals, including computer hardware definitions and words and phrases about software, operating systems, peripherals and troubleshooting.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question
  • Excel 2003 - How to sum up a chart with percentage

    Thank you for visiting ITKE. We are happy to help you with solving specific IT questions, but need as much information as possible to do so. Let us know about the problem you are trying to solve, ...

  • Domino R6 & Crystal Reports 11 for reporting on the web

    a) Yes. We are using CR (earlier version) to report against Domino data via a browser. b) One method: Put all desired types on the report, in different sections. Have user select in the report opt...

  • print graphs from AS400

    You could investigate using Java (sorry) as there are graphics classes and from what I've seen and read, Java works quite well on the 400. Good luck.

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.