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Graphing for Six Sigma

published on August 5, 2013

In Six Sigma we are always collecting data, generally we are collecting data to address a current problem in our operations or services. The wonderful thing about Six Sigma is that we are also able to collect passive data. The usefulness of passive data is that it provides us with the ability to identify patterns, the catch to visualizing these patterns is in selecting the right graph to view the data.

 Why use a graph?

The first benefit that comes to mind is the ability to see the error trends from a visual perspective. The other reasons graphs are a great tool are:

  • Alongside identifying trends, they also help you see potential variable relationships. When you have a situation that could have multiple culprits, a graph can help you see which ones are a real potential.
  • They can help you identify the risks that your customers will determine critical. This move allows your customer to be proactive instead of reactive, a much more desirable trait.
  • It allows you to systematically dismiss variables and determine which one’s control other ones.
  • It shows you the results of the passive data you’ve collected.

Where do I get the information for a graph?

Data is everywhere right? Yes and No. Your graph is only as good as your data, so we don’t want questionable data. The integrity of your data will be defined by your individual organization, but if you stick to these three questions you should be fine:

  • What do you need the data to tell you?
  • How often do you need to collect it?
  • How do you need to collect it?

Next week we will get into the types of graphs and what times of data are appropriate for them. Until then happy hunting!

published on August 5, 2013


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