 
   
         Dear David, Dear R Users,
   
   Calculation of Cross-Validation for SVM, with thoese time series which include negative and positive values ( for example return of a stock exchange index) must be different from a calculation of Cross-Validation with time series which includes just absolute values( for example a stock exchange index). 
  How is it calculated for a return time series? 
  Thank you very much for any help.
  Amir 
   
   
   

		
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