Capability Statistics

This menu calculates capability statistics. These are used to assess the extent to which the output of a process lies within its specification limits. The data values consist of samples of measurements made on successive occasions.

Data Arrangement

Specifies the form of the data. Select List of Samples if the data are supplied in separate variates, select One Set with Groups if the data are to be supplied as a variate with a grouping factor and select One Set equal group size if the data are in a single variate with equal-sized blocks of values for each group.

List of Samples

Used to enter the names of the variates containing the data measurements. The

button allows multiple selections to be copied from Available Data. This option is only available when the data arrangement is set to List of Samples.

Samples

Used to enter the name of a variate containing the data measurements. This option is only available when the data arrangement is set to One set with Groups or One Set equal group size.

Groups

Provides a space to enter a factor identifying the different samples. This option is only available when the data arrangement is set to One set with Groups.

Group Size

Provides a space to enter a value identifying the size of each sample. This option is only available when the data arrangement is set to One Set equal group size.

Display

Specifies the output to be displayed.

Cpk	displays the Cpk index
Ppk	displays the Ppk index

Lower Limit

Provides a space for you to supply a value for the lower specification limit of the process.

Upper Limit

Provides a space for you to supply a value for the upper specification limit of the process.

Available Data

This lists data structures appropriate to the current input field. The contents will change as you move from one field to the next. Double-click on a name to copy it to the current input field; alternatively, you can type the name directly into the input field.