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MOVING
AVERAGE / RANGE CHARTS
Moving Average / Range Charts
are a set of control charts for variables data (data that is both quantitative
and continuous in measurement, such as a measured dimension or time). The
Moving Average chart monitors the process location over time, based on the
average of the current subgroup and one or more prior subgroups. The
Range chart monitors the process variation over time.
The plotted points for a
Moving Average / Range Chart, called a cell, include the current subgroup
and one or more prior subgroups. Each subgroup within a "cell"
may contain one or more observations, but must all be of the same size.
See also:
SPC Concepts
When
to Use a Moving Average / Range Chart
Interpreting
a Moving Average / Range Chart
For a general discussion
of Moving Average Charts, refer to any Statistical Quality Control textbook,
such as (Pyzdek, 1990, 1992a) or (Montgomery, 1991).
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