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Dissertations / Theses on the topic 'Mean chart'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Hussain, Mohd Razali. "Estimating the process mean shift from out-of-control points on autocorrelated x̄ charts." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178309692.

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2

Cho, Gyo-Young. "Multivariate control charts for the mean vector and variance-covariance matrix with variable sampling intervals." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37242.

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3

Wang, Sai. "GLR Control Charts for Monitoring the Mean Vector or the Dispersion of a Multivariate Normal Process." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77227.

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In many applications, the quality of process outputs is described by more than one characteristic variable. These quality variables usually follow a multivariate normal (MN) distribution. This dissertation discusses the monitoring of the mean vector and the covariance matrix of MN processes. The first part of this dissertation develops a statistical process control (SPC) chart based on a generalized likelihood ratio (GLR) statistic to monitor the mean vector. The performance of the GLR chart is compared to the performance of the Hotelling Χ² chart, the multivariate exponentially weighted movin

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Hussain, Mohd Razali. "Estimating the process mean shift from out-of-control points on autocorrelated− ^- Charts." Ohio University / OhioLINK, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178309692.

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5

Andersson, Fredrik, and Alexander Idemark. "Unsupervised topic modeling for customer support chat : Comparing LDA and K-means." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105353.

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Fortnox takes in many errands via their support chat. Some of the questions can be hard to interpret, making it difficult to know where to delegate the question further. It would be beneficial if the process was automated to answer the questions instead of need to put in time to analyze the questions to be able to delegate them. So, the main task is to find an unsupervised model that can take questions and put them into topics. A literature review over NLP and clustering was needed to find the most suitable models and techniques for the problem. Then implementing the models and techniques and

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6

Yap, Tet Loong. "An evaluation of frequency-volume charts in men with lower urinary tract symptoms." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536829.

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7

Lanza, Giacomo. "Investigation of biochar stability by means of gas isotopic measurements." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18410.

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Untersuchungsgegenstand der vorliegenden Dissertation sind biomassebasierte Kohlen (Biokohlen, biochar), welche für eine langfristige Kohlenstoffspeicherung in Böden mit dem gleichzeitigen Ziel der zusätzlichen Bodenverbesserung hergestellt werden. Die Auswahl der Kohlen umfasste Kohlen aus Pyrolyse- und hydrothermale Carbonisierung (HTC). In dieser Arbeit werden einige zentrale Phänomene, die bei deren Ausbringung in einem bestehenden Bodenökosystem auftreten können, nähergehend untersucht. Einerseits beeinflusst das fremde Material den Stoffwechsel und die Abundanz und Vielfalt innerhalb der

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YANG, LIUJING. "The measurement of antenna VSWR by means of a Vector Network Analyzer." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-98287.

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The VSWR is an important entity when assessing the properties of an antenna. This report presents measurements of the VSWR, related to antennas, by means of a Vector Network Analyzer. The open/short/load calibration method is used as a preparation before the actual measurement in order to obtain accurate results. The way that the VSWR depends on frequency is illustrated by three measurment methods: direct measurement of the VSWR, by using 𝑆11, or by using the Smith chart. The results are compared and conclusions are drawn.

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Berdnikova, Tatiana. "Ranking." Master's thesis, Vysoká škola ekonomická v Praze, 2017. http://www.nusl.cz/ntk/nusl-360007.

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This thesis aims to compile and evaluate six monocriteria and one multi-criteria ranking in the meat processing industry. These rankings are primarily focused on the needs of smaller potential investors and their purpose is to facilitate their investment decisions and to recommend the most appropriate investment opportunity. In the theoretical part is analyzed the concept of ranking and other related concepts. In addition, there are described the interests of individual ranking users and briefly introduced the most well-known rankings. The content of the methodological part are particular step

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Choi, Kwok To Maurice. "Online dating as a strategic game : why and how men in Hong Kong Use QQ to chase women in mainland China." HKBU Institutional Repository, 2011. http://repository.hkbu.edu.hk/etd_ra/1217.

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Sferlea, Elena. "L'évolution de l'administration locale : les cas de la Roumanie et de la France depuis le début des années 1990." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST2007.

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Cette recherche porte sur l'évolution de l'administration locale en Roumanie et en France depuis ledébut des années 1990. L'étude de la situation de départ différente dans les deux pays a étépoursuivie par l'analyse des grandes étapes du développement du cadre juridique relatif auxcollectivités territoriales : l'avènement (en Roumanie) ou le renforcement (en France) du statutconstitutionnel des collectivités et l'évolution du cadre législatif opérant les transferts decompétences et de moyens en faveur des collectivités. Cette analyse a mis en évidence uneconception des réformes qui présente bi

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12

Wu, Pei-Ching, and 吳佩青. "Process Capability Measures with Control Chart Mean Shift Consideration." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/87671692126367843235.

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碩士<br>國立交通大學<br>工業工程與管理系所<br>94<br>Process capability indices have been proposed in the manufacturing industry to provide numerical measures on process reproduction capability, which are effective tools for quality assurance and guidance for process improvement. Motorola, Inc. introduced its Six Sigma quality initiative to the world in the 1980s. Some quality practitioners questioned why the Six Sigma advocates claim it is necessary to add a 1.5 shift to the average when estimating process capability. Bothe (2002) provides a statistical reason for including such a shift in the process average

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Chiu, Chun-kuo, and 邱俊國. "Applying Multivariate Control Chart to Monitor the Process Mean Vector." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/70300736970544522674.

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碩士<br>國立雲林科技大學<br>工業工程與管理研究所碩士班<br>95<br>Traditionally, multivariate control chart is used to monitor the process under normality. However, while the quality characteristics are not normally distributed, implementing the control chart assumed normally will result in the excessive false alarm rate. In this research, we will transform the data which assumed to be multivariate gamma distribution into normality and monitor the process mean vector of transformed data in Hotelling’s control chart. In this paper, we show that the transformed data are approximate normally distributed in detecting pr

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14

Huang, Chi-Jui, and 黃啟瑞. "Monitoring Process Mean and/or Variability with a Single GWMA Chart." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/42215758000088423109.

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博士<br>國立臺灣科技大學<br>工業管理系<br>100<br>To detect small shifts in the process mean or variability as early as possible, Sheu and Griffith, Sheu and Lin, and Sheu and Tai developed and applied the generally weighted moving average (GWMA) control chart. The addition of an adjustment parameter makes the GWMA control chart more sensitive than the exponentially weighted moving average (EWMA) control chart in detecting small process shifts. However, recently, considerable attention has been drawn toward methods that use a single chart for monitoring the process mean and variability. The main problem addre

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Li, Yuan-Yi, and 李源翌. "Process Capability Measurement for Weibull Processes with Control Chart Mean Shift Consideration." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/66630631050969939598.

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碩士<br>國立交通大學<br>工業工程與管理系所<br>95<br>The process capability indices have been proposed to assess the ability of a process to meet preset specification limits and provide quality assurance. The process capability index has been one of the most popular index used in the manufacturing industry dealing with problem of measuring reproduction capability of process to enhance product development with very low fraction of defectives(in Parts Per million; PPM). Motorola, Inc. introduced its Six Sigma quality initiative to the world in the 1980s. Some quality practitioners questioned why the Six Sigma a

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16

Tai, Shih-Hung, and 戴世鴻. "Joint Monitoring of Process Mean and VariabilityUsing Generally Weighted Moving Average Control Chart." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/99462418836531950423.

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博士<br>國立臺灣科技大學<br>工業管理系<br>93<br>Most applications of the EWMA control chart for monitoring processes depend on detecting shifts in the process mean. The problem of detecting an increase in process variability, which can also strongly affect the quality of products is perhaps more important. This study develops the simultaneous monitoring of process mean and process variability using a single control chart based on a generalization of the exponentially weighted moving average (EWMA) control chart. This generalized chart, is called herein the generally weighted moving average (GWMA) control cha

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17

Yi-HsuanWeng and 翁奕軒. "An information-theoretical based process control chart for monitoring process mean and variance." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/51259687980621729762.

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碩士<br>國立成功大學<br>工業與資訊管理學系<br>103<br>The objective of this study is to construct a new type of control chart based on Kullback-Leibler distance of information theory. We name this control chart Information-Theoretical Based Process Control Chart (IPC( , ) control chart). This study considers detecting the mean shift, variance shift and both shift of a normally distributed process. We use a statistic which is a derivation of Kullback-Leibler distance to construct the IPC( , ) control chart. The control limits of the control chart are obtained by simulation with 100,000 runs when in-control avera

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18

Hsu, Ting-Jung, and 許庭榕. "Combining Hotelling’s T2 and |S| Control Chart Monitoring Process Mean Vector and Covariance Matrix." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/77427202211662105197.

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碩士<br>國立雲林科技大學<br>工業工程與管理研究所碩士班<br>93<br>Many researchers want to develop a method to monitor process mean and variance in a single control chart. The major difficulty is how to design a single control chart to indicate clearly whether the process mean or process variance is out of control or both out of control. In this study, we apply the Max chart method developed by Chen and Cheng to the multivariate process and combine Hotelling’s T2 control chart and |S| control chart in a single control chart to monitor process mean vector and covariance matrix at the same time.

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19

Huang, Chao-Ching, and 黃昭晴. "Assessing the Effectiveness of Bootstrap Control Chart for Monitoring the Process Mean for Lognormal Distribution." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34294105592131486519.

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碩士<br>國立交通大學<br>工業工程與管理系所<br>102<br>The control limits of a traditional X-bar control chart are derived under the assumption that the process data follow a normal distribution. However, the Type I and Type II errors may have a higher chance to occur in using the X-bar chart to monitor the process when data follow a non-normal distribution. In the past, there are studies utilized non-parametric bootstrap methods to construct control limits based on non-normal distributions. These studies have applied the Percentile Bootstrap (PB) confidence interval in constructing the X-bar control limits. How

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20

Chang, Geng-Ming, and 張耕銘. "Monitoring Process Mean/Location Parameter and Variance/Scale Parameter by Using Nonparametric EWMA Control Chart." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/19440377324298793553.

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21

Yu-HsiangHuang and 黃鈺翔. "A Kullback-Leibler information based process control chart for process mean subject to linear drift." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6wex6a.

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碩士<br>國立成功大學<br>工業與資訊管理學系<br>106<br>The objective of this thesis is to investigate the design and the performance of control chart with respect to a statistical process control (SPC) monitoring problem. In particular, this thesis develops a control chart (called the IPC-D chart) for monitoring the normal process mean subject to linear drift. We construct the IPC-D chart derived from Kullback-Leibler information (K-L distance). The performance of IPC-D chart which is measured by average run length (ARL) is compared to generalized likelihood ratio (GLR) charts, cumulative sum (CUSUM) charts and

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22

Liu, Chi-Shuan, and 劉季旋. "Design of Single-Featured EWMA-X (SFEWMA-X) Control Chart Using Individual Observations for Detecting Process Mean Shifts and Standard Deviation Changes." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/xcs95k.

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博士<br>國立臺北科技大學<br>工商管理研究所<br>100<br>Quality control chart is an important tool for process monitoring and quality improvement. Several combined control charts have been proposed to enhance the detection ability in detecting small and large process parameter changes simultaneously. However, these control charts require calculating and monitoring two statistics along with two sets of control limits. This study propose a new control chart using individual observations, called a single featured EWMA-X (SFEWMA-X) control chart, to monitor both small and large process mean shifts and process standar

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23

Huang, Xin-Ren, and 黃信仁. "Multivariate Control Chart for Monitoring Process Mean Vector and Covariance Matrix Simultaneously and Its Economic-Statistical Design and Statistically Minimum Loss Design." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/33223445338603677746.

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碩士<br>國立雲林科技大學<br>工業工程與管理研究所<br>88<br>A product is typically evaluated by the customer on the basis of multiple quality characteristics. In this study, it is assumed that the process quality characteristics’ random vector has a multivariate normal distribution. We apply the likelihood ratio test for developing the multivariate control chart which can monitor the process mean vector and covariance matrix simultaneously. Moreover, we develop economic statistical design and minimum loss statistical design for the multivariate control chart provided that the quality characteristics are

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24

Theng, Cheng Jane, and 鄧靜楨. "Analysis of Means and Shewhart Control Chart." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/58269616501881732050.

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25

Shu-Fen, Chang, and 張淑芬. "Using Analysis of Means to Innovate EWMA Control Chart." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/85908476380344771135.

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26

Wu, Sin Hong, and 吳信宏. "Study on design of double sampling mean and variance control charts." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/31218523354470458909.

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碩士<br>國立政治大學<br>統計學系<br>104<br>Control charts are effective tools for detecting manufacturing processes and service processes. Nowadays, much of the data in manufacturing or service industries comes from processes having non-normal or unknown distributions. The commonly used Shewhart control charts, which depend heavily on the normality assumption, are not appropriately used for this situation. In this paper, we propose a standardized dynamic double sampling asymmetric EWMA mean control chart (SDDS EWMA-AM chart), a standardized dynamic double sampling asymmetric EWMA variance control chart (S

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27

Hsieh, Yu-tai, and 謝育泰. "Extend GWMA Control Charts in Monitoring the Process Mean and/or Variance." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/68469511852768336932.

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博士<br>國立臺灣科技大學<br>工業管理系<br>97<br>The generally weighted moving average (GWMA) control chart was developed in the 2003s. Due to the added adjustment parameter, the weight function of the GWMA is more flexible and the GWMA control chart performs substantially better than the exponentially weighted moving average (EWMA) control chart for monitoring small shifts in the process mean. Besides the process mean shifts, it is also important to monitor either the process variance or both mean and variance simultaneously. The main problem addressed in this study is to develop the new control chart by GWM

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Wu, Yung-Piao, and 吳永標. "Stock Trend Prediction by Sequential Chart Pattern via K-Means and AprioriAll Algorithm." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/844d4n.

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碩士<br>國立臺灣科技大學<br>資訊工程系<br>100<br>This paper investigates stock market investment issues on stock market we present a model to predict the stock trend based on STPS (Stock Trend Prediction by Sequential chart Pattern via K-Means and AprioriAll Algorithm). Predict method follow operations are performed : (1) the Chart Pattern Extractor by sliding window size and Haar wavelet transfer (2) the Chart Recognition by correlation coefficient (3) Chart Pattern Clustering by K-Means algorithm (4) Sequential Clustering Chart Pattern by AprioriAll Algorithm (5) Trend Analysis by statistic sequential clu

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29

Sanders, Chris. "M4M online chat rooms : the use of gay websites by men seeking men /." 2005.

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Thesis (M.A.)--York University, 2005. Graduate Programme in Sociology.<br>Typescript. Includes bibliographical references (leaves 115-122). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url%5Fver=Z39.88-2004&res%5Fdat=xri:pqdiss &rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR11886

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Huang, Wei-Heng, and 黃偉恆. "Control Charts for Monitoring the Mean and Standard Deviation of Non-Normal Processes." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/97652790192118770929.

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博士<br>國立交通大學<br>統計學研究所<br>104<br>Among the statistical process control tools, the control chart has been proven to be effective in process monitoring. The Shewhart X-chart and S-chart are the most commonly used statistical control charts for monitoring the process mean and variability based on the assumption that the distribution of the quality characteristic is normal. However, in real applications, many process distributions may follow a positively-skewed distribution such as the lognormal distribution. In this dissertation, we first discuss the construction of several control charts for mon

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31

Lin, Ming Yi, and 林明毅. "The Proper Selection of Control Charts under Small Sustained Shifts in the Process Mean." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/23627282091394776890.

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碩士<br>國立成功大學<br>統計學系<br>86<br>The Shewhart control charts are used by most factories but it can not effectively detect the small sustained shifts in the process mean, hence high-tech companies have started using the exponentially weighted moving average control chart (EWMA) and cumulative sum control chart (CUSUM) for monitoring the process and product quality. Prior research have shown that EWMA and CUSUM control charts have similar performance, but most quality engineers have the problem

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32

Chiu, Shih-Chen, and 邱士珍. "Economical design of X-bar control charts under the mean shift and variance increasing." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/n46em2.

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碩士<br>國立屏東科技大學<br>工業管理系所<br>105<br>Dr. Duncan put forward economical Design of X-bar Control Charts in 1956. This model only considers the mean shift. However, the variation increasing in the process can also possibly occur. Therefore, this study makes the discussion in view of this part and the Duncan’s model was extended. Through the Visual Basic software to carry on a computerized system development and design that optimizes the quality control chart. Apart from considering the mean shift, the variance increases influences on sample size, interval between samples and width of control limits

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洪在萬. "A study of economic design of X charts to control non-normal process means." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/42658764304128250224.

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Thomas, Allen Britton. "Internet chat room participation and the coming-out experiences of young gay men a qualitative study /." 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3086714.

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Rice, Shelia Renee Tortolero Susan Shegog Ross. "Internet as a medium to seek partners among men who have sex with men." 2008. http://proquest.umi.com.www5.sph.uth.tmc.edu:2048/pqdweb?did=1495953291&sid=1&Fmt=2&clientId=92&RQT=309&VName=PQD.

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Thesis (Ph. D.)--University of Texas School of Public Health. Thesis (Ph. D.)--University of Texas Health Science Center at Houston, School of Public Health, 2008.<br>Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 0973. Adviser: Michael W. Ross. Includes bibliographical references.

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LIU, YU-TING, and 劉育婷. "Effect of Sodium Nitrite and Sodium Lactate on the Keeping Quality of Chinese Basted Meat (Char Siu) Stored at Ambient Temperature." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/13908769724703916346.

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