Peihua Qiu's Introduction to Statistical Process Control PDF

By Peihua Qiu

ISBN-10: 1439847991

ISBN-13: 9781439847992

ISBN-10: 1482220415

ISBN-13: 9781482220414

A significant software for qc and administration, statistical technique keep watch over (SPC) screens sequential tactics, akin to construction traces and net site visitors, to make sure that they paintings stably and satisfactorily. in addition to masking conventional equipment, Introduction to Statistical method Control describes many contemporary SPC tools that increase upon the extra verified thoughts. The author—a prime researcher on SPC—shows how those tools can deal with new applications.

After exploring the position of SPC and different statistical equipment in quality controls and administration, the publication covers uncomplicated statistical recommendations and strategies valuable in SPC. It then systematically describes conventional SPC charts, together with the Shewhart, CUSUM, and EWMA charts, in addition to fresh keep an eye on charts in keeping with change-point detection and primary multivariate SPC charts lower than the normality assumption. The textual content additionally introduces novel univariate and multivariate keep watch over charts for circumstances whilst the normality assumption is invalid and discusses keep watch over charts for profile tracking. All computations within the examples are solved utilizing R, with R services and datasets to be had for obtain at the author’s web site.

Offering a scientific description of either conventional and more moderen SPC tools, this e-book is perfect as a chief textbook for a one-semester path in disciplines curious about procedure qc, similar to information, commercial and structures engineering, and administration sciences. it will probably even be used as a supplemental textbook for classes on caliber development and procedure administration. moreover, the booklet presents researchers with many beneficial, fresh study effects on SPC and provides qc practitioners worthy directions on imposing up to date SPC techniques.

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Additional info for Introduction to Statistical Process Control

Example text

By the way, in statistics, it is a convention to use Z to denote a random variable that has the standard normal distribution. 2 Chi-square distribution If X1 , X2 , . . , Xk are independent normal random variables with means µ1 , µ2 , . . , µk , respectively, and with a common variance one, then the distribution of Q = X12 + X22 + · · · + Xk2 is called the non-central chi-square distribution with k degrees of freedom (df) and with a non-central parameter δ = µ12 + µ22 + . . + µk2 . By notation, it is denoted as Q ∼ χk2 (δ ).

15) with the coefficient φ . 2 based on samples of size m = 100 each collected at consecutive time points. 41). 2. 502), so that its nominal ARL0 is 200. 7 + The first 10 values of Xn , X n , sn , Zn , and Cn,SS , respectively. 7) for some commonly used ARL0 and λ values. 635) (so that its nominal ARL0 value is 200 in all three cases) and when the process observations are correlated and follow the AR(1) model with the coefficient φ . 5 occurs at the initial observation time in various cases considered.

In phase II, the process is believed to be IC at the beginning, and our major goal is to monitor the process online to make sure that it keeps running stably. To this end, manufactured products are sampled sequentially over time, and observations of the quality characteristics of the sampled products are monitored using a SPC chart, and the chart gives a signal once it detects a significant special cause deviation of the quality characteristics. After a signal of a special cause deviation is delivered, the process should be stopped immediately, and the special causes should be figured out and removed.

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Introduction to Statistical Process Control by Peihua Qiu


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