Record nummer 1947628
Titel Estimating missing values in time series
toon extra info.
A. Smits, P.K. Baggelaar
Auteur(s) Smits, A. ; Baggelaar, P.K.
Uitgever Nieuwegein : RIWA
Jaar van uitgave 2010
Pagina's 20 p ill
ISBN 9789066831421
Online full text
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Trefwoorden (cab) drinkwater / oppervlaktewater / watervoorziening / monitoring / tijdreeksen / schatting / waarden / samenstelling / oppervlaktewaterkwaliteit
Rubrieken Wiskundige statistiek / Watervoorziening
Publicatie type Boek
Taal Engels
Toelichting (Engels) RIWA is managing and maintaining a water quality monitoring network to identify (undesired) changes in quality, testing water against the IAWR target values and underpinning goals and requirements. The necessary data is taken from member companies, governments and, to a limited extent, from our own additional research. Despite the rather strict design criteria, time series of water quality data are regularly interrupted so that it is more difficult to obtain statistically sound statements. This can be due to a multitude of causes, such as changes in analytical methodology, switching between laboratories doing the analysis, miscommunication, or (temporary) financial cuts. The missing values cause difficulties in producing reliable and sound statements about the variables concerned. An initial survey showed that estimating missing values with time series analysis (Box-Jenkins transfer modelling) might provide good results. This was tested with simulations, using series of monthly averages of chloride. A full year of data was omitted from a series of data from Lobith and then the missing values were estimated using chloride data from the upstream site of Cologne and discharge data from Lobith. This gave promising results.
Betrokken instanties Vereniging van Rivierwaterbedrijven (RIWA)
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