qcc
.
This class of objects is returned from
qcc
. In addition,
shewhart
creates objects of class
c("shewhart", "qcc")
inheriting from classes
"qcc"
and
"shewhart"
, and
cusum
creates objects of class
c("cusum", "shewhart", "qcc")
, inheriting from
"qcc"
,
"shewhart"
,
and
"cusum"
.
An object of class
"qcc"
represents data from an in-control process
necessary to produce a Shewhart or cusum quality control chart.
Objects of class
"shewhart"
and
"cusum"
contain additional
information pertinent to Shewhart and cusum control charts.
The class
"qcc"
has methods for the following generic function:
print
Class
"shewhart"
inherits from class
"qcc"
and class
"cusum"
inherits
from classes
"shewhart"
and
"qcc"
.
The
"qcc"
object is implemented as a list with the following components:
statistics
computed as specified by
type
.
"xbar"
,
"s"
,
"R"
,
"p"
,
"np"
,
"u"
, or
"c"
.