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Autocorrelation and univariate time series modelling for grass fluoride and airborne fluoride concentrations



Autocorrelation and univariate time series modelling for grass fluoride and airborne fluoride concentrations



Environmental Pollution 43(2): 115-128



The dependence of observed fluoride levels.sbd.grass, gaseous air and particulate air.sbd.on previous levels was investigated in the field situation. Autocorrelation was found in grass fluoride observations, and to a lesser extent was present in both gaseous and particulate airborne fluorides. Univariate time series models were obtained which accounted for 56-66% of total variation in grass fluoride, 31% in gaseous airborne and 26% in particulate airborne fluorides. The large amount of variation unexplained by the models was thought to be due to the influence of environmental and meteorological factors not included in the models, and random variation due to day-to-day and plot-to-plot variation.

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Accession: 001533906

Download citation: RISBibTeXText

PMID: 15092805

DOI: 10.1016/0269-7491(87)90070-4



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