Dear all R user,
  
 Please forgive me if my question is too simple.
  
 My question is related to Statistics rather directly to R. Suppose I have two time series of spot prices of two commodities X and Y for two years. Now I want to see what percentage of spot price of X is explained by Y. Yes I can fit a regression equation of X on Y. But my question is, is it legitimate? Because both series are non-stationary with very high auto-correlation of order 1. And regression analysis is basically designed for cross-sectional data, not for time series data.
  
 Your help will be highly appreciable.
  
 Thanks and regards,
 Ron


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