Capability Analysis for Multiple Variables (Normal Distrbution) - Options
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Stat > Quality Tools > Capability Analysis > Multiple Variables (Normal) > Options

Use to specify a process target. Minitab then calculates Cpm in addition to the standard capability statistics. You can choose to perform just the within subgroup, between/within subgroup, or overall analysis. You can also choose to include confidence intervals for capability indices.

You can set preferences for the sigma tolerance for capability statistics and the display of either the capability statistics or the benchmark Z statistics using Tools > Options > Control Charts and Quality Tools > Capability analysis.

Dialog box items

Targets (Display Cpm): Enter one value, multiple values, or a column that Minitab uses as a target. One value applies to all variables. Multiple values correspond to columns listed in Variables. Minitab then calculates Cpm, in addition to the standard capability statistics.

Use tolerance of K*sigma for capability statistics K= Enter one value, multiple values or a column that Minitab uses to calculate capability statistics using an interval other than 6 standard deviations wide (3 on each side of the process mean). One value applies to all variables. Multiple values correspond to columns listed in Variables. Minitab interprets these values as two-sided tolerances. If you want to use a one-sided tolerance, enter a two-sided tolerance value that is twice that of your one-sided tolerance. For example, if you want a one-sided tolerance of 3 sigma, enter 6.

Perform Analysis

Within or between/within subgroup analysis: Check to perform within or between/within analysis.

Overall analysis: Check to perform overall analysis.

Note

The Perform Analysis options are ignored with a Johnson transformation..

Display

Capability stats (Cp, Pp): Choose to display capability statistics.

Benchmark Z's (sigma level): Choose to display benchmark Z statistics.

Parts per million: Choose to display the expected and observed out-of-spec in parts per million.

Percents: Choose to display the expected and observed out-of-spec in percents.

Include confidence intervals: Check to include confidence intervals of Cp, Cpk, Pp, and Ppk.

Confidence level: Enter a confidence level between 0 and 100 (default is 95.0).

Confidence intervals: Choose to get two-sided confidence intervals (the default) or just an upper or lower confidence bound.