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  gladwin
  
2011 Oct 07
2
Data frame aggregation
Hello,
Could anybody help me with this question?
Example data frame
NAME     TICKER     SHARES     PERFORMANCE
John      ABC        100        0.05       
John      ABC        1000       1.5        
Alice     EFG        20         0.3       
Paul      HIJ        50         1.0
Paul      JKL        60         2.0
Paul      MNO        12         3.0
I would like to aggregate this dataframe by