Multiple Stream Control Charts

[under construction]

Things to consider:

  • The usual assumptions for standard SPC charts apply (independent observations; identically distributed)

  • Is there cross-correlation between streams?

StatSoft Online Help - Multiple Stream Processes

Book: "Innovative Control Charting: Practical Spc Solutions for Today's Manufacturing Environment" (on Amazon.com)

  • ISBN-10: 0873893859

  • ISBN-13: 978-0873893855

Group Control Charts (GCC)

  • proposed by Boyd (1950)

  • described in Burr (1976), Pyzdek (1992, Chapter 21) and Montgomery (1997, Section 8.3)

Article: Statistical Process Control of Multiple Stream Processes

  • Authors - Mortell, Robert R.; Runger, George C.

  • ASQ QICID: 11395

  • "A model that allows correlation between the streams is described and a simple control strategy is recommended. Performance comparisons are provided."

Article: SPC of Multiple Stream Processes - a chart for enhanced detection of shifts in one stream