stats.S: Functions to plot Shewhart S chart
In qcc: Quality Control Charts

Description Usage Arguments Value Author(s) References See Also

These functions are used to compute statistics required by the S chart.

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stats.S(data, sizes)
sd.S(data, sizes, std.dev = c("UWAVE-SD", "MVLUE-SD", "RMSDF"))
limits.S(center, std.dev, sizes, conf)

`data`	the observed data values
`center`	sample/group center statistic.
`sizes`	samples sizes. Optional
`std.dev`	within group standard deviation. Optional for `sd.S` function, required for `limits.S`. See `sd.xbar`.
`conf`	a numeric value used to compute control limits, specifying the number of standard deviations (if `conf` > 1) or the confidence level (if 0 < `conf` < 1).

The function stats.S returns a list with components statistics and center.

The function sd.S returns std.dev the standard deviation of the statistic charted.

The function limits.S returns a matrix with lower and upper control limits.

Luca Scrucca

Montgomery, D.C. (2005) Introduction to Statistical Quality Control, 5th ed. New York: John Wiley & Sons.
Wetherill, G.B. and Brown, D.W. (1991) Statistical Process Control. New York: Chapman & Hall.

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qcc documentation built on May 2, 2019, 9:15 a.m.