Cusum Quality Control Chart Object

DESCRIPTION:

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

GENERATION:

This class of objects is returned from cusum.

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

METHODS:

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

identify

INHERITANCE:

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

STRUCTURE:

The "cusum" object is implemented as a list with the all of the components of an object of class "shewhart", except for cntrl.limits, plus the following additional components:

VALUE:

cusum.upper
a vector of the upper cumulative sums.
cusum.lower
a vector of the lower cumulative sums.