Usage
ewma(data, sizes, center, std.dev, lambda = 0.2, nsigmas = 3,
data.name, labels, newdata, newsizes, newlabels,
plot = TRUE, ...)## S3 method for class 'ewma.qcc':
print(x, \dots)
## S3 method for class 'ewma.qcc':
summary(object, digits = getOption("digits"), ...)
## S3 method for class 'ewma.qcc':
plot(x, add.stats = TRUE, chart.all = TRUE,
label.limits = c("LCL", "UCL"), title, xlab, ylab, ylim,
axes.las = 0, digits = getOption("digits"),
restore.par = TRUE, ...)
Arguments
data
a data frame, a matrix or a vector containing observed data for the variable to chart. Each row of a data frame or a matrix, and each value of a vector, refers to a sample or ''rationale group''.
sizes
a value or a vector of values specifying the sample sizes associated with each group. If not provided the sample sizes are obtained counting the non-NA elements of each row of a data frame or a matrix; sample sizes are set all equal to one if
center
a value specifying the center of group statistics or target.
std.dev
a value or an available method specifying the within-group standard deviation(s) of the process.
Several methods are available for estimating the standard deviation. See sd.xbar and lambda
the smoothing parameter $0 \le \lambda \le 1$
nsigmas
a numeric value specifying the number of sigmas to use for computing control limits.
data.name
a string specifying the name of the variable which appears on the plots. If not provided is taken from the object given as data.
labels
a character vector of labels for each group.
newdata
a data frame, matrix or vector, as for the data argument, providing further data to plot but not included in the computations.
newsizes
a vector as for the sizes argument providing further data sizes to plot but not included in the computations.
newlabels
a character vector of labels for each new group defined in the argument newdata.
plot
logical. If TRUE an EWMA chart is plotted.
add.stats
a logical value indicating whether statistics and other information should be printed at the bottom of the chart.
chart.all
a logical value indicating whether both statistics for data and for newdata (if given) should be plotted.
label.limits
a character vector specifying the labels for control limits.
title
a string giving the label for the main title.
xlab
a string giving the label for the x-axis.
ylab
a string giving the label for the y-axis.
ylim
a numeric vector specifying the limits for the y-axis.
axes.las
numeric in {0,1,2,3} specifying the style of axis labels. See help(par).
digits
the number of significant digits to use.
restore.par
a logical value indicating whether the previous par settings must be restored. If you need to add points, lines, etc. to a control chart set this to FALSE.
object
an object of class 'ewma.qcc'.
x
an object of class 'ewma.qcc'.
...
additional arguments to be passed to the generic function.