XbarR estimates μw and σw using the ranges of the samples. It is best used when the sample size of a continuous variable is between 2 and 10.

RChart plots the sample ranges. It is typically used in conjunction with XbarR.

XbarS estimates μw and σw using the means and standard deviations of the samples. It is best used when the sample size of a continuous variable is at least 10.

SChart plots the sample standard deviations. It is typically used in conjunction with XbarS.

XmR is a moving range chart. It is used when the sample size of a continuous variable is one.

EWMA (Exponentially Weighted Moving-Average) plots weighted moving average values. It is used when the sample size of a continuous variable is one.