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In de statistiek staat X voor een invloedsfactor, ook wel verklarende variabele genoemd.
Xbar and R Charts
A control chart which is a representation of process capability over time; displays the variability in the process average and range across time.
The most critical elements to control to keep the Y under control. Similar to Root Cause(s). For Example, if the Y you want to control is your weight, the Xs may be the amount of exercise you get or food intake.