Pareto chart 1

Pareto chart

Pareto chart

One of the Seven Basic Tools of QualityFirst described by Joseph M. Juran

Purpose To assess the most frequently-occurring defects by category†

A Pareto chart, named after Vilfredo Pareto, is a type of chart that contains both bars and a line graph, whereindividual values are represented in descending order by bars, and the cumulative total is represented by the line.

Simple example of a Pareto chart using hypothetical data showing the relative frequencyof reasons for arriving late at work

The left vertical axis is the frequencyof occurrence, but it can alternativelyrepresent cost or another important unitof measure. The right vertical axis isthe cumulative percentage of the totalnumber of occurrences, total cost, ortotal of the particular unit of measure.Because the reasons are in decreasingorder, the cumulative function is aconcave function. To take the exampleabove, in order to lower the amount oflate arriving by 80%, it is sufficient tosolve the first three issues.

The purpose of the Pareto chart is tohighlight the most important among a(typically large) set of factors. Inquality control, it often represents themost common sources of defects, the

highest occurring type of defect, or the most frequent reasons for customer complaints, and so on.

These charts can be generated by simple spreadsheet programs, such as OpenOffice.org Calc and Microsoft Exceland specialized statistical software tools as well as online quality charts generators.The Pareto chart is one of the seven basic tools of quality control.[1]

Pareto chart 2

References[1] Nancy R. Tague (2004). "Seven Basic Quality Tools" (http:/ / www. asq. org/ learn-about-quality/ seven-basic-quality-tools/ overview/

overview. html). The Quality Toolbox. Milwaukee, Wisconsin: American Society for Quality. p. 15. . Retrieved 2010-02-05.

Further reading• Hart, K. M., & Hart, R. F. (1989). Quantitative methods for quality improvement. Milwaukee, WI: ASQC Quality

Press.• Juran, J. M. (1962). Quality control handbook. New York: McGraw-Hill.• Juran, J. M., & Gryna, F. M. (1970). Quality planning and analysis. New York: McGraw-Hill.• Montgomery, D. C. (1985). Statistical quality control. New York: Wiley.• Montgomery, D. C. (1991). Design and analysis of experiments, 3rd ed. New York: Wiley.• Pyzdek, T. (1989). What every engineer should know about quality control. New York: Marcel Dekker.• Vaughn, R. C. (1974). Quality control. Ames, IA: Iowa State Press.

Article Sources and Contributors 3

Article Sources and ContributorsPareto chart  Source: http://en.wikipedia.org/w/index.php?oldid=411681632  Contributors: A. B., AbsolutDan, Anonymous Dissident, AugPi, BlckKnght, Boxplot, Celique, Ck lostsword,Cootha, Craigwb, DanielPenfield, Dashuler@gmail.com, DylanW, Elbac14, Feureau, Gribeco, Hu12, Imroy, Irishguy, Kormie, LilHelpa, MBlakley, MdG, Melcombe, Metacomet, MichaelHardy, NajaB, NawlinWiki, Nbarth, Nlskrg, Noe, Nubiatech, ParetoDaddy, PhilKnight, Pm master, Pscott22, Ronz, Rupertb, Seav, Srleffler, Stevegallery, Stillnotelf, SueHay, T-turtle, Taffykins,Takahashi J, Top Jim, Tuyvan, Verne Equinox, Waycool27, WoodenBooks, 85 anonymous edits

Image Sources, Licenses and ContributorsImage:Pareto chart of titanium investment casting defects.svg  Source: http://en.wikipedia.org/w/index.php?title=File:Pareto_chart_of_titanium_investment_casting_defects.svg  License:GNU Free Documentation License  Contributors: User:DanielPenfieldFile:Pareto.PNG  Source: http://en.wikipedia.org/w/index.php?title=File:Pareto.PNG  License: Public Domain  Contributors: Original uploader was Metacomet at en.wikipedia

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