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Creating charts and graphs to improve your manufacturing process
A Pareto chart is actually a special type of bar chart that has values that are plotted in descending order. This chart was named after Vilfredo Pareto, but it was made popular in quality assurance by Joseph Juran and Kaoru Ishikawa. This chart is only one of the seven basic tools of quality control. The other six tools are: histogram, check sheet, control chart, cause and effect diagram, flowchart, and scatter diagram.
The good news about using a Pareto chart in six sigma is that it is actually rather easy to construct and it serves a very good purpose, not to mention the fact that the Pareto chart is full of information, which can be the answers to questions that your company has about quality control or anything else. The first thing that you need to do when setting up a Pareto chart is that you are going to need to construct the chart by segmenting the range of data into groups. Basically what this means is that you are going to need to group all of the data that you have into different categories. Then you are going to need to set up the right (cumulative percentage) and left (frequency of occurrence) side of the vertical axis. Then you are going to need to determine the number of data points that reside within each group and put the chart together. When it comes to reading and constructing the Pareto chart one thing that you need to keep in mind is that even though it is a type of bar graph there is still a difference between the bar graph and the Pareto chart. That difference is the fact that the Pareto chart is ordered in descending frequency magnitude and that the groups are defined by the users. And in companies who use the Pareto chart with six sigma use the chart to answer certain questions like: What are the largest issues facing our team or business? What 20% of sources are causing 80% of the problems? |
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