For data with variable sample size, the value of this option must be a list of control limits for each sample. The second element is the value of the upper control limit. The first element is the value of the lower control limit. The default value is 0.9973, corresponding to a 3 sigma confidence level.Ĭontrollimits=deduce or - This option specifies the values for the control limits. The value of this option must be a list containing the color of the control limits, center line, data to be plotted, and the specification limits.Ĭonfidencelevel= realcons - This option specifies the required confidence level. The options argument can contain one or more of the following options.Ĭolor= list - This option specifies colors of the various components of the X-bar chart. If X is a single data sample, the second parameter n is used to specify the size of individual samples.Īll computations involving data are performed in floating-point therefore, all data provided must have type realcons and all returned solutions are floating-point, even if the problem is specified with exact values.įor more information about computation in the ProcessControl package, see the ProcessControl help page.
Note, that the individual samples can be of variable size. Each value represents an individual observation. The first parameter X is either a single data sample - given as a Vector or list - or a list of data samples. Unless explicitly given, the mean, the standard deviation and the control limits are computed based on the data. The chart also contains the upper control limit (UCL), the lower control limit (LCL), and the mean value (represented by the center line) of the underlying quality characteristic. The XBarChart command generates control chart for the average mean level (X-bar chart) for the observations.
(optional) parameters to pass to the plot command (optional) equation(s) of the form option=value where option is one of color, confidencelevel, controllimits, ignore, mu, sigma, or speclimits specify options for generating the X-bar chart XBarChart( X, n, options, plotoptions )
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