mqcs.mewma | R Documentation |
This function is used to compute statistics required by the mewma chart.
mqcs.mewma(x, ...) ## Default S3 method: mqcs.mewma( x, data.name = NULL, limits = NULL, Xmv = NULL, S = NULL, method = "sw", plot = FALSE, ... ) ## S3 method for class 'mqcd' mqcs.mewma( x, limits = NULL, Xmv = NULL, S = NULL, lambda = 0.1, method = "sw", plot = FALSE, ... )
x |
an R object (used to select the method). See details. |
... |
arguments passed to or from methods. |
data.name |
a string that specifies the title displayed on the plots. If not provided it is taken from the name of the object's data. |
limits |
a two-values vector specifying the control limits. |
Xmv |
is the mean vector. It is only specified for Phase II or when the parameters of the distribution are known. |
S |
is the sample covariance matrix. It is only used for Phase II or when the parameters of the distribution are known. |
method |
is the method employed to compute the covatiance matrix in the individual observation case. Two methods are used "sw" for compute according to (Sullivan,Woodall 1996a) and "hm" by (Holmes,Mergen 1993) |
plot |
a logical value indicating that it should be plotted. |
lambda |
is the smoothing constant. Only values of 0.1, 0.2,...,0.9 are allowed. |
Edgar Santos-Fernandez
## ## Continuous data ## library(qcr) data(dowel1) str(dowel1) data.mqcd <- mqcd(dowel1) res.mqcs <- mqcs.mewma(data.mqcd) summary(res.mqcs) plot(res.mqcs, title =" MEWMA Control Chart for dowel1")
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