Pareto and Bar ChartsDate: 03/12/97 at 07:38:35 From: mike king Subject: Pareto and Bar charts Hello, I am asking for my nephew. His book is somewhat shallow on this subject. My question is, what are three distinguishing differences between Pareto Charts and Bar Charts? As I look at them from his book, it seems that they are very similar. I can't seem to find much of a difference other than a percentage line up the right side of a pareto chart. Thanks. Mike Date: 03/12/97 at 14:49:21 From: Doctor Mike Subject: Re: Pareto and Bar charts Hello, I used AltaVista to do an Internet search for information. A Pareto chart is a special kind of bar chart used for a special purpose. The following explanation and a good color example of one can be found at: http://www.sas.com/rnd/app/qc/qcparish.html The Pareto chart, used to determine priorities for quality improvement activities, is a bar chart that displays the relative frequency of problems in a process or operation. Each bar represents the relative frequency of a problem, and the bars are arranged in decreasing order from left to right. Sometimes a curve is superimposed to indicate the cumulative percent of problem frequencies. The chart is named after Vilfredo Pareto (1848-1923), an Italian economist. Pareto charts provide a tool for visualizing the Pareto principle, which states that a small subset of problems (the "vital few") affecting a common outcome tend to occur much more frequently than the remainder (the "useful many"). A Pareto chart can be used to decide which subset of problems should be solved first, or which problems deserve the most attention. Pareto charts are often constructed to provide a before-and-after comparison of the effect of control or quality improvement measures. Another nice example is at http://www.theriver.com/qa-inc/paretoch.html -Doctor Mike, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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