Ensor, Katherine B.2009-06-042009-06-041991Dittrich, Gayle Lynn. "A time series approach to quality control." (1991) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/13492">https://hdl.handle.net/1911/13492</a>.https://hdl.handle.net/1911/13492One way that a process may be said to be "out-of-control" is when a cyclical pattern exists in the observations over time. It is necessary that an accurate control chart be developed to signal when a cycle is present in the process. Two control charts have recently been developed to deal with this problem. One, based on the periodogram, provides a test based on a finite number of frequencies. The other method uses a test which estimates a statistic which covers all frequency values. However, both methods fail to estimate the frequency value of the cycle and are computationally difficult. A new control chart is proposed which not only covers a continuous range of frequency values, but also estimates the frequency of the cycle. It in addition is easier to understand and compute than the two other methods.67 p.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.StatisticsThesisThesis Stat. 1991 Dittrich