S Control Chart.
This function builds a S control chart.
The data to be plotted.
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.
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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