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Control chart
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==Alternative bases== In 1935, the [[British Standard|British Standards Institution]], under the influence of [[Egon Pearson]] and against Shewhart's spirit, adopted control charts, replacing ''3-sigma'' limits with limits based on [[percentile]]s of the [[normal distribution]]. This move continues to be represented by [[John Oakland]] and others but has been widely deprecated by writers in the Shewhart–Deming tradition.
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