{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,24]],"date-time":"2025-10-24T08:08:50Z","timestamp":1761293330046},"reference-count":0,"publisher":"Walter de Gruyter GmbH","issue":"2","funder":[{"name":"FCT","award":["PEst-OE\/MAT\/UI0822\/2014, PEst-OE\/MAT\/UI4080\/2014"],"award-info":[{"award-number":["PEst-OE\/MAT\/UI0822\/2014, PEst-OE\/MAT\/UI4080\/2014"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2015,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Joint schemes for the process mean and the variance are essential to determine if unusual\nvariation in the location and spread of a quality characteristic occurred.\nThis paper comprises a systematic study on the phenomena of <jats:italic>misleading<\/jats:italic>, <jats:italic>unambiguous<\/jats:italic> and <jats:italic>simultaneous signals<\/jats:italic> while dealing with Shewhart and EWMA joint schemes for the process mean and the variance of a normally distributed quality characteristic.\nExamples have been added to illustrate how the R statistical software can be used to assess the performance of joint schemes in practice, namely when it comes to the occurrence of those valid signals.<\/jats:p>","DOI":"10.1515\/eqc-2015-0001","type":"journal-article","created":{"date-parts":[[2015,10,20]],"date-time":"2015-10-20T20:47:24Z","timestamp":1445374044000},"page":"99-110","source":"Crossref","is-referenced-by-count":4,"title":["On Valid Signals in Joint Schemes for the Process Mean and Variance"],"prefix":"10.1515","volume":"30","author":[{"given":"T\u00e2nia","family":"Ralha","sequence":"first","affiliation":[{"name":"Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"given":"Manuel Cabral","family":"Morais","sequence":"additional","affiliation":[{"name":"Department of Mathematics & CEMAT (Center for Computational and Stochastic Mathematics), Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"given":"M. Ros\u00e1rio","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Department of Mathematics & CEMAT (Center for Computational and Stochastic Mathematics), Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]}],"member":"374","published-online":{"date-parts":[[2015,10,20]]},"container-title":["Economic Quality Control"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/eqc-2015-0001\/xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/eqc-2015-0001\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,3,31]],"date-time":"2023-03-31T17:58:52Z","timestamp":1680285532000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/eqc-2015-0001\/html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,10,20]]},"references-count":0,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2015,10,20]]},"published-print":{"date-parts":[[2015,12,1]]}},"alternative-id":["10.1515\/eqc-2015-0001"],"URL":"https:\/\/doi.org\/10.1515\/eqc-2015-0001","relation":{},"ISSN":["0940-5151","1869-6147"],"issn-type":[{"value":"0940-5151","type":"print"},{"value":"1869-6147","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,10,20]]}}}