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R/S statistical method for time series of pollutants in environmental quality assessment


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R/S statistical method for time series of pollutants in environmental quality assessment
Bu Quanmin12Tong Xing12
1.School of Government; 2.Center for Social Risk and Public Crisis Management, Nanjing University,Nanjing 210023,China
environmental quality assessment pollutant concentration time series rescaled range statistical analysis method Hurst index
In order to obtain scientific and comprehensive environmental quality assessment conclusion,the time series stochastic volatility of pollutant density is studied here.The complexity of time series change can be quantified through fractal analysis,and the rescaled range statistical analysis method(R/S)is used to obtain the fixed value of pollutants concentration which is regarded as the value of pollutants in environmental quality assessment.Three methods are proposed for the calculation of Hurst index:(1)the same point method;(2)step average method;(3)dislocation average method.The statistical regularity of dislocation average method of R/S statistical method of pollutant concentration time sequence is the best regularity from the three kinds of methods of graph.A contrast research is finished.The research results show that the dislocation average R/S method is suitable for obtaining Hurst index.


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Last Update: 2013-08-31