Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Manuel Cabral Morais"'
Publikováno v:
IEEE Access, Vol 10, Pp 84622-84625 (2022)
We provide comments on a research paper proposing a control chart to monitor the scale parameter of a Rayleigh distribution. Our primary focus is on improving its average run length profile. We determine limits such that, on average, one can detect a
Externí odkaz:
https://doaj.org/article/0a3e95cb441842569b1e94e034529434
Autor:
Manuel Cabral Morais
Publikováno v:
Entropy, Vol 25, Iss 3, p 444 (2023)
The geometric first-order integer-valued autoregressive process (GINAR(1)) can be particularly useful to model relevant discrete-valued time series, namely in statistical process control. We resort to stochastic ordering to prove that the GINAR(1) pr
Externí odkaz:
https://doaj.org/article/64ebf31dcf794bb8b2f2af22cfa26fe8
Autor:
Manuel Cabral Morais, António Pacheco
Publikováno v:
Revstat Statistical Journal, Vol 14, Iss 4 (2016)
Examples of time series of counts arise in several areas, for instance in epidemiology, industry, insurance and network analysis. Several time series models for these counts have been proposed and some are based on the binomial thinning operation, na
Externí odkaz:
https://doaj.org/article/b561e10e5fc3494faaa0410700d6b895
Publikováno v:
Revstat Statistical Journal, Vol 12, Iss 3 (2014)
Misleading signals (MS) are valid alarms which correspond to the misinterpretation of a shift in the process mean (resp. variance) as a shift in the process variance (resp. mean), when we deal with simultaneous schemes for these two parameters. MS ca
Externí odkaz:
https://doaj.org/article/a590448035394b0ab01dc66db9fb4883
Publikováno v:
Stochastics and Quality Control. 38:11-24
Independence between successive counts is not a sensible premise while dealing, for instance, with very high sampling rates. After assessing the impact of falsely assuming independent binomial counts in the performance of np-charts, such as the one w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be989029749d2c5f40a4b677407ef844
https://doi.org/10.1515/eqc-2022-0052
https://doi.org/10.1515/eqc-2022-0052
Autor:
António Pacheco, Wolfgang Schmid, Patrícia Ferreira Ramos, Manuel Cabral Morais, Taras Lazariv
Publikováno v:
Quality and Reliability Engineering International. 36:642-651
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b315fa5c9045e45dd2e8093b6d7bb648
https://doi.org/10.1002/qre.2598
https://doi.org/10.1002/qre.2598
Publikováno v:
Stochastics and Quality Control. 34:9-18
The traffic intensity (ρ) is a vital parameter of queueing systems because it is a measure of the average occupancy of a server. Consequently, it influences their operational performance, namely queue lengths and waiting times. Moreover, since many
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80589e506043bb154196bc4718b22b56
https://doi.org/10.1515/eqc-2018-0026
https://doi.org/10.1515/eqc-2018-0026
Publikováno v:
Frontiers in Statistical Quality Control 13 ISBN: 9783030678555
Counted output, such as the number of defective items per sample, is often assumed to have a marginal binomial distribution. The integer and asymmetrical nature of this distribution and the value of its target mean hinders the quality control practit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::346bf2e97fc0f2108b6f01e56e076053
https://doi.org/10.1007/978-3-030-67856-2_6
https://doi.org/10.1007/978-3-030-67856-2_6
Autor:
Wolfgang Schmid, Ivan Semeniuk, Patrícia Ferreira Ramos, Manuel Cabral Morais, António Pacheco, Taras Lazariv
Publikováno v:
AStA Advances in Statistical Analysis. 103:289-303
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::95046426d7280b5330d8bc9c0f0b9dc1
https://doi.org/10.1007/s10182-018-00344-y
https://doi.org/10.1007/s10182-018-00344-y
Publikováno v:
Sequential Analysis. 37:487-510
Shewhart control charts are known to be somewhat insensitive to shifts of small and moderate size. Expectedly, alternative control schemes such as the exponentially weighted moving average (EWMA) c...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c1876d47a47079ee7a78a777bf0ea02
https://doi.org/10.1080/07474946.2018.1554889
https://doi.org/10.1080/07474946.2018.1554889