Correspondence Analysis on a Space-Time Data Set for Multiple Environmental Variables
Palma Monica
Universitá del Salento, Lecce, Italy.
DOI: 10.4236/ijg.2015.610090   PDF   HTML   XML   3,545 Downloads   4,223 Views   Citations


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.

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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.

Conflicts of Interest

The authors declare no conflicts of interest.


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