stats.T2: Statistics used in computing and drawing the Hotelling T^2...
In qcc: Quality Control Charts

Description Usage Arguments Value Author(s) References See Also

These functions are used to compute statistics required by the T^2 chart.

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stats.T2(data, center = NULL, cov = NULL)

limits.T2(ngroups, size, nvars, conf)

`data`	the observed data values
`center`	a vector of values to use for center of input variables.
`cov`	a matrix of values to use for the covariance matrix of input variables.
`ngroups`	number of groups
`size`	sample size
`nvars`	number of variables
`conf`	confidence level (0 < `conf` < 1)

The function stats.T2 returns a list with components:

`statistics`	a vector of values for the T^2 statistic
`means`	a matrix of within group means for each variable
`center`	sample/group center statistic
`S`	covariance matrix

The function limits.T2 returns a list with components:

`control`	control limits
`prediction`	pred.limits

Luca Scrucca

Mason, R.L. and Young, J.C. (2002) Multivariate Statistical Process Control with Industrial Applications, SIAM.
Montgomery, D.C. (2005) Introduction to Statistical Quality Control, 5th ed. New York: John Wiley & Sons.
Ryan, T. P. (2000), Statistical Methods for Quality Improvement, 2nd ed. New York: John Wiley & Sons, Inc.

mqcc, stats.T2.single

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