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drkstr747
drkstr747
Level I

what is "observed PPM", "expected within PPM", and "expected overall PPM"?

Feb 13, 2025 09:06 PM (1867 views)

I was analyzing the process capability of a large data set to understand its PPM, and I noticed that under "nonconformance" tab, there are the following column names: Observed PPM, Expected Within PPM, and Expected Overall PPM.

 

What is the difference between these PPM?

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jthi
Super User jthi
Super User

Re: what is "observed PPM", "expected within PPM", and "expected overall PPM"?

Feb 14, 2025 12:19 AM (1847 views)  |  Posted in reply to message from drkstr747 02-13-2025

Most likely those are same values as your Observed % but turned into PPM (parts per million). Usually you can use "?" tool from toolbar to figure out where to find the documentation but that doesn't always find the correct place, this seems to have best information I could quickly find from JMP help Example of Process Capability for a Stable Process

 

The estimates of out-of-specification product given in the Nonconformance report provide a direct measure of process performance. The PPM values in the Nonconformance report indicate that Gap hardly ever falls below the lower specification limit (1.4 parts per million). However, the number of parts for which Gap falls above the upper specification limit is 1869.0 parts per million.

 

-Jarmo

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