Statistical Process Control Charts
The essence of statistical process control implementation is the use of various charts, which are found in all SPC software packages.
SPC Control Charts
The control chart is a basic tool of statistical process control and shows whether a process is statistically stable. SPC control charts can differentiate between process variations that are normal and those that change over time due to other causes.
Fishbone Diagrams
Also called herringbone diagrams, cause-and-effect diagrams or Ishikawa diagrams, Fishbone diagrams do not have a statistical basis, but are great for problem-solving, and can reveal relationships among different variables.
Frequency Histograms
The histogram is a basic tool of statistical process control and provides info on:
• average (mean) of the data
• variation present in the data
• pattern of variation
• if the process is within spec
SPC Run Charts
Run charts show process characteristics over time and are used to study relationships between variables.
Pareto Charts
Pareto charts display the most frequently-occurring factors and are used to make best use of limited resources by targeting the most important problems to tackle.
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