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    STUDIA PHYSICA - Issue no. SPECIAL ISSUE / 2001  
         
  Article:   LOCAL CHARACTERIZATION OF TIME SERIES BY DETRENDED FLUCTUATION ANALYSIS (DFA).

Authors:  CRISTIAN V.L. POP, IOAN TURCU, LORELAI I. CIORTEA.
 
       
         
  Abstract:  The data obtained in experiments performed on dynamic processes in biophysical systems are generally very long time series and have significant temporal non-stationary fluctuations. Such a time series are obtained, for example, by measuring the coherent light intensity scattered at small angles by a human erythrocyte suspension during the sedimentation process. The purpose of our work was to investigate the sedimentation process and to characterize the local temporal correlation using two modified versions of the DFA method. Each version give a set of local scaling exponents obtained by applying the DFA on successive shorter data domains. The information given only by one value of the scaling exponent has a global character and cannot describe the local temporal correlation for long processes.  
         
     
         
         
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