Control limit: Difference between revisions
wikademia>Jayen466 make clear that it is s.d. of the plotted statistics, not the s.d. of the raw values |
wikademia>Melcombe m revised categories |
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Control limits should not be confused with ''tolerance limits'', which are completely independent of the [[distribution]] of the plotted sample statistic. | Control limits should not be confused with ''tolerance limits'', which are completely independent of the [[distribution]] of the plotted sample statistic. | ||
[[Category: | [[Category:Statistical terminology]] | ||
[[Category:Statistical charts and diagrams]] | |||
[[Category:Management]] | [[Category:Management]] | ||
[[Category:Measurement]] | [[Category:Measurement]] | ||
Revision as of 12:16, 2 June 2008
Control limits are horizontal lines drawn on an statistical process control chart, usually at a distance of ±3 standard deviations of the plotted statistic from the statistic's mean.
For normally distributed statistics, the area bracketed by the control limits will on average contain 99.73% of all the plot points on the chart, as long as the process is and remains in statistical control.
Control limits should not be confused with tolerance limits, which are completely independent of the distribution of the plotted sample statistic.
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