Variables Data Data values which are measurements of some quality or characteristic of the process. The data values are used to construct the control charts. This qualitative data is used for the x-bar, R-, s- and individuals charts, as well as the CUSUM and moving range charts.
Variance A measure of the spread of a set of data from its mean, abbreviated:
σ2 for a population
s2 for a sample 2
2 1 1
( ) Sample Variance =
in n i
i i i i
x x x x
ns n n
= = − −
Variation The differences among individual results or output of a
machine or process. Variation is classified in two ways: variation due to common causes and variation due to special causes.
X-Chart A control chart used for process in which individual measurements of the process are plotted for analysis. Also called an individuals chart or I-chart.
X-bar ( X ) Chart A control chart used for processes in which the averages of subgroups of process data are plotted for analysis.
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