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  2. Shewhart individuals control chart - Wikipedia

    en.wikipedia.org/wiki/Shewhart_individuals...

    The resulting plots are analyzed as for other control charts, using the rules that are deemed appropriate for the process and the desired level of control. At the least, any points above either upper control limits or below the lower control limit are marked and considered a signal of changes in the underlying process that are worth further ...

  3. Control chart - Wikipedia

    en.wikipedia.org/wiki/Control_chart

    Control charts are graphical plots used in production control to determine whether quality and manufacturing processes are being controlled under stable conditions. (ISO 7870-1) [1] The hourly status is arranged on the graph, and the occurrence of abnormalities is judged based on the presence of data that differs from the conventional trend or deviates from the control limit line.

  4. x̅ and R chart - Wikipedia

    en.wikipedia.org/wiki/X̅_and_R_chart

    In statistical process control (SPC), the ¯ and R chart is a type of scheme, popularly known as control chart, used to monitor the mean and range of a normally distributed variables simultaneously, when samples are collected at regular intervals from a business or industrial process. [1]

  5. Statistical process control - Wikipedia

    en.wikipedia.org/wiki/Statistical_process_control

    Statistical process control (SPC) or statistical quality control (SQC) is the application of statistical methods to monitor and control the quality of a production process. This helps to ensure that the process operates efficiently, producing more specification-conforming products with less waste scrap.

  6. Walter A. Shewhart - Wikipedia

    en.wikipedia.org/wiki/Walter_A._Shewhart

    Shewhart framed the problem in terms of assignable-cause and chance-cause variation and introduced the control chart as a tool for distinguishing between the two. Shewhart stressed that bringing a production process into a state of statistical control , where there is only chance-cause variation, and keeping it in control, is necessary to ...

  7. Nelson rules - Wikipedia

    en.wikipedia.org/wiki/Nelson_rules

    Nelson rules are a method in process control of determining whether some measured variable is out of control (unpredictable versus consistent). Rules for detecting "out-of-control" or non-random conditions were first postulated by Walter A. Shewhart [1] in the 1920s.

  8. Piglet Learning to Hop Onto the Couch Will Only Work for Cheese

    www.aol.com/piglet-learning-hop-onto-couch...

    Even though you can potty train a pig, you can't control how large they and their messes become. Although many folks are misled by the idea of 'teacup pigs,' there isn't truly a miniature pig breed .

  9. Distribution-free control chart - Wikipedia

    en.wikipedia.org/.../Distribution-free_Control_Chart

    There are distribution-free control charts for both Phase-I analysis and Phase-II monitoring. One of the most notable distribution-free control charts for Phase-I analysis is RS/P chart proposed by G. Capizzi and G. Masaratto. RS/P charts separately monitor location and scale parameters of a univariate process using two separate charts.