Signal Interpretation in Hotelling's T2 Control Chart for Compositional Data
dc.contributor.author
dc.date.accessioned
2016-05-27T08:07:54Z
dc.date.available
2017-01-28T04:00:05Z
dc.date.issued
2016-01-28
dc.identifier.issn
0740-817X
dc.identifier.uri
dc.description.abstract
Nowadays, control of concentrations of elements is of crucial importance in industry. Concentrations are expressed in terms of proportions or percentages which means that they are compositional data (CoDa). CoDa are defined as vectors of positive elements that represent parts of a whole and usually add to a constant sum. Classical T2 control chart is not appropriate for CoDa, for which is better to use a compositional T2 control chart (T2C CC). This paper generalizes the interpretation of the out-of-control signals of the individual T2C CC for more than three components. We propose two methods for identifying the ratio of components that mainly contribute to the signal. The first one is suitable for low dimensional problems and consists on finding the log ratio of components that maximizes the univariate T2 statistic. The second one is an optimized method for large dimensional problems that simplifies the calculus by transforming the coordinates into the sphere. We illustrate the T2C CC signal interpretation with a practical example from the chemical and pharmaceutical industry
dc.description.sponsorship
This work has been partially financed by the Ministerio de Ciencia e Innovaci´on (Ref: MTM2012-
33236) and the Ag`encia de Gesti´o d’Ajuts Universitaris i de Recerca (AGAUR), Generalitat de
Catalunya (Ref: 2014SGR551)
dc.format.extent
12 p.
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Taylor and Francis
dc.relation
info:eu-repo/grantAgreement/MINECO//MTM2012-33236/ES/METODOS ESTADISTICOS EN ESPACIOS RESTRINGIDOS/
AGAUR/2014-2016/2014 SGR-551
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Versió postprint del document publicat a: http://dx.doi.org/10.1080/0740817X.2015.1125042
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© IIE Transactions. Special Issue: Quality & Reliability Engineering, 2016, vol. 48, núm. 7, p. 661-672
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Articles publicats (D-IMAE)
dc.rights
Tots els drets reservats
dc.source
Vives Mestres, Marina Daunis i Estadella, Josep Martín Fernández, Josep Antoni 2016 Signal Interpretation in Hotelling's T2 Control Chart for Compositional Data IIE Transactions 48 7 661 672
dc.subject
dc.title
Signal Interpretation in Hotelling's T2 Control Chart for Compositional Data
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/openAccess
dc.type.version
info:eu-repo/semantics/acceptedVersion
dc.identifier.doi
dc.identifier.idgrec
024575
dc.contributor.funder
dc.relation.ProjectAcronym
dc.identifier.eissn
1545-8830