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Correspondence Analysis on a Space-Time Data Set for Multiple Environmental Variables

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DOI: 10.4236/ijg.2015.610090    3,231 Downloads   3,683 Views  
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ABSTRACT

Applications of the multivariate technique called correspondence analysis for environmental studies are relatively new and are limited to spatial multivariate data set. In this paper, a procedure of applying correspondence analysis to a large space-time data set for multiple environmental variables is shown. In particular, nitrogen dioxide and carbon monoxide hourly concentrations measured during January 1999 at several monitored stations in a district of Northern Italy are analyzed. The procedure consists in transforming the continuous variables into categorical ones by the means of appropriate indicator variables, generating special contingency tables and applying correspondence analysis. The use of this classical multivariate technique allows the identification of important relationships among pollution levels and monitoring stations and/or relationships among pollution levels and observation times.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Monica, P. (2015) Correspondence Analysis on a Space-Time Data Set for Multiple Environmental Variables. International Journal of Geosciences, 6, 1154-1165. doi: 10.4236/ijg.2015.610090.

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