This function builds a S control chart.

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`x` |
The data to be plotted. |

`type` |
A character string specifying the type of S control chart to be plotted where "n" plots a S chart with normalized probability limits and "e" plots a S chart with exact limits. |

`m` |
The sample sizes. Only necessary in the control chart with exact (probability) limits. |

The exact limits are the alpha/2 and 1-alpha/2 quantiles of the S distribution which is proportional to the square root of a chi-square distribution.

Return a S control chart.

Daniela R. Recchia, Emanuel P. Barbosa

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