topic Re: Process Screening Drift Summaries in Discussions

Process Screening Drift Summaries

Chris_Ng — Mon, 20 Apr 2020 16:40:49 GMT

Hi All,

Are there any more documentations available for the outputs generated from the Process Screening Report. In particular, I would like to understand how JMP calculates the Drift Summary values. I am aware that they are using Holt's Double EWMA Smoother on the parameters but there is no explanation on the Drift Summary values. Trying to understand the math behind before attempting to use it to screen through a large number of variables to determine if any of them are drifting "significantly".

Thanks!

Re: Process Screening Drift Summaries

txnelson — Mon, 20 Apr 2020 19:37:53 GMT

You should contact JMP Support for the answer on this.

support@jmp.com

The have access to the developers

Re: Process Screening Drift Summaries

Chris_Ng — Tue, 21 Apr 2020 10:29:50 GMT

Okay thanks. Will give that a try.

Re: Process Screening Drift Summaries

sseligman — Tue, 21 Apr 2020 18:53:25 GMT

Chris,

The calculation of the drift values in Process Screening is described in more detail in this paper by John Sall: Scaling-up process characterization (starting at the bottom of the page numbered 73). A further reference (also given in the aforementioned paper) is this book by Hyndman, et al:

Hyndman, Koehler, Ord, and Snyder. 2008. Forecasting with exponential smoothing, the state space approach, Berlin: Springer Verlag.

Re: Process Screening Drift Summaries

Chris_Ng — Wed, 22 Apr 2020 11:52:43 GMT

Hi sseligman,

Thanks for the document! This should be what I was looking for.