Methods and formulas for graphs in Between/Within Capability Sixpack

Histogram

The histogram is displayed with two normal curves.

Black dashed curve
This normal distribution is generated using the process mean and the between/within standard deviation.
Red solid curve
This normal distribution is generated using the process mean and the overall standard deviation.

For information on how the standard deviations are calculated, go to Methods for Between/Within Capability Sixpack and click "Estimating standard deviation".

Probability plot

For information on the calculations used to create the normal probability plots, go to Methods and formulas for probability plot in Individual Distribution Identification.

Charts

For between/within capability sixpack, Minitab displays and individuals and moving range chart. For information on the methods used for the I chart, go to Methods and formulas for Individuals Chart. For information on the methods used for the MR chart, go to Methods and formulas for Moving Range Chart.

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