Description Usage Arguments Value Author(s) References See Also
These functions are used to compute statistics required by the T^2 chart for individual observations.
1 2 3 | stats.T2.single(data, center = NULL, cov = NULL)
limits.T2.single(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 < |
The function stats.T2.single
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 (which is equal to |
center |
sample/group center statistic |
S |
covariance matrix |
The function limits.T2.single
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.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.