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Pareto chart : ウィキペディア英語版
Pareto chart

A Pareto chart, named after Vilfredo Pareto, is a type of chart that contains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line.
The left vertical axis is the frequency of occurrence, but it can alternatively represent cost or another important unit of measure. The right vertical axis is the cumulative percentage of the total number of occurrences, total cost, or total of the particular unit of measure. Because the reasons are in decreasing order, the cumulative function is a concave function. To take the example below, in order to lower the amount of late arrivals by 78%, it is sufficient to solve the first three issues.
The purpose of the Pareto chart is to highlight the most important among a (typically large) set of factors. In quality control, it often represents the most common sources of defects, the highest occurring type of defect, or the most frequent reasons for customer complaints, and so on. Wilkinson (2006)
devised an algorithm for producing statistically based acceptance limits (similar to confidence intervals) for each bar in the Pareto chart.
These charts can be generated by simple spreadsheet programs, such as Apache OpenOffice/LibreOffice Calc 〔(Chart Type Column and Line )〕 and Microsoft Excel,〔Pareto Chart in Excel (Best Excel Tutorial )〕 visualization tools such as Tableau Software,〔(Pareto in Tableau )〕 specialized statistical software tools, and online quality charts generators.
The Pareto chart is one of the seven basic tools of quality control.
==See also==

*Control chart
*Histogram
*Pareto analysis
*Quality control
*Seven Basic Tools of Quality
*Statistical process control (SPC)
*7 QC Tools

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Pareto chart」の詳細全文を読む



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