ASQ

Exclusive Content & Downloads from ASQ

On the Distribution of the Usual Estimator of C and Some Applications in SPC

Summary: [This abstract is based on the authors' abstract.] A derivation of the distribution of C(pk) for a normally distributed quality characteristic is proposed. The formula is based on the folded normal distribution when the sample mean and the sample standard deviation are independent. The resulting formula can be implemented in any modern math package. The ARL performance of a control chart based on C(pk) is compared with the performance of X-bar and R charts.

Anyone with a subscription, including Site and Enterprise members, can access this article.


Other Ways to Access content:

Join ASQ

Join ASQ as a Full member. Enjoy all the ASQ member benefits including access to many online articles.

  • Topics: Statistical Process Control (SPC)
  • Keywords: Average run length (ARL), Process capability index (Cpk), Process capability (Cp), Statistical process control (SPC)
  • Author: Novoa, Clara; Artiles-Leon, Noel
  • Journal: Quality Engineering