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- C-chart abstract "In statistical quality control, the c-chart is a type of control chart used to monitor "count"-type data, typically total number of nonconformities per unit. It is also occasionally used to monitor the total number of events occurring in a given unit of time.The c-chart differs from the p-chart in that it accounts for the possibility of more than one nonconformity per inspection unit, and that (unlike the p-chart and u-chart) it requires a fixed sample size. The p-chart models "pass"/"fail"-type inspection only, while the c-chart (and u-chart) give the ability to distinguish between (for example) 2 items which fail inspection because of one fault each and the same two items failing inspection with 5 faults each; in the former case, the p-chart will show two non-conformant items, while the c-chart will show 10 faults. Nonconformities may also be tracked by type or location which can prove helpful in tracking down assignable causes. Examples of processes suitable for monitoring with a c-chart include:Monitoring the number of voids per inspection unit in injection molding or casting processesMonitoring the number of discrete components that must be re-soldered per printed circuit boardMonitoring the number of product returns per dayThe Poisson distribution is the basis for the chart and requires the following assumptions:The number of opportunities or potential locations for nonconformities is very largeThe probability of nonconformity at any location is small and constantThe inspection procedure is same for each sample and is carried out consistently from sample to sampleThe control limits for this chart type are where is the estimate of the long-term process mean established during control-chart setup.".
- C-chart thumbnail C_control_chart.svg?width=300.
- C-chart wikiPageID "18998891".
- C-chart wikiPageRevisionID "583793206".
- C-chart distribution Poisson_distribution.
- C-chart hasPhotoCollection C-chart.
- C-chart meanchart "C control chart.svg".
- C-chart measurementtype "Number of nonconformances in a sample".
- C-chart name "c-chart".
- C-chart proposer Walter_A._Shewhart.
- C-chart qualitycharacteristictype Variable_and_attribute_(research).
- C-chart sizeofshift "≥ 1.5σ".
- C-chart subgroupsize "n > 1".
- C-chart subject Category:Quality_control_tools.
- C-chart subject Category:Statistical_charts_and_diagrams.
- C-chart type Artifact100021939.
- C-chart type Implement103563967.
- C-chart type Instrumentality103575240.
- C-chart type Object100002684.
- C-chart type PhysicalEntity100001930.
- C-chart type QualityControlTools.
- C-chart type Tool104451818.
- C-chart type Whole100003553.
- C-chart comment "In statistical quality control, the c-chart is a type of control chart used to monitor "count"-type data, typically total number of nonconformities per unit. It is also occasionally used to monitor the total number of events occurring in a given unit of time.The c-chart differs from the p-chart in that it accounts for the possibility of more than one nonconformity per inspection unit, and that (unlike the p-chart and u-chart) it requires a fixed sample size.".
- C-chart label "C-chart".
- C-chart sameAs Diagram_c.
- C-chart sameAs m.04jcnfj.
- C-chart sameAs Q5005933.
- C-chart sameAs Q5005933.
- C-chart sameAs C-chart.
- C-chart wasDerivedFrom C-chart?oldid=583793206.
- C-chart depiction C_control_chart.svg.
- C-chart isPrimaryTopicOf C-chart.