Cpk/Ppk Week over Week trend chart

[#1]

Hi Everyone,

How can we have a plot for CPK/PPK Week over Week trend? I would like to compare the results across weeks to see if the results improves/worsens? 

I sample script would be best helpful :)

Thanks! 

[#2 · Accepted solution]

Assuming you have a data table that has a column that indicates the week and a column that contains the measurement values, with the Spec Limits populated as Column Properties for the measurement Column.

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Go to

     Analyze=>Quality and Process=>Process Capability

Fill in the Y, Process variable and place the column that has your week value into the "By" selection area

txnelson_1-1654204271077.png

In the output report window, hold down the CNTL key, and then click on the red triangle for the Process Capability, and select

     Summary Reports=>Within Sigma Summary Report

Holding down the CNTL key will signal JMP to create the report for all of the Weeks.

txnelson_2-1654204549983.png

Right click on the summary report, and select

     Create Combined Data Table

txnelson_3-1654204660716.png

This will create a new data table that has all of the Cp/Cpk information for each week, which you can then use as your report

txnelson_4-1654204792979.png