Shewhart Quality Control Chart Object

DESCRIPTION:

Class of objects that results from producing a Shewhart control chart. The class is shewhart.

GENERATION:

This class of objects is returned from shewhart. In addition, cusum creates objects of class c("cusum", "shewhart", "qcc"), inheriting from "shewhart" and "qcc".

An object of class "shewhart" contains all the information pertinent to a Shewhart quality control chart.

METHODS:

The class "shewhart" has methods for the following generic functions:

print

identify

INHERITANCE:

Class "shewhart" inherits from class "qcc" and class "cusum" inherits from classes "shewhart" and "qcc".

STRUCTURE:

The "shewhart" object is implemented as a list with the all of the components of an object of class "qcc" plus the following additional components:

VALUE:

new.statistics
a vector of group summary statistics for new data.
new.sizes
vector of group sample sizes for new data.
target
the target value of the process if specified.
cntrl.limits
the control limits.
newdata.name
a character string (vector of length 1) containing the name of the new input data.