Posts by Victor Oliveira • 33 points

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  Q: In R, how to calculate the average of one column based on another?

  I have the following table XLSX: I need to calculate the SP500 column average for each year. I did it with 'Mean(namedabela$SP500)' and found the total average. Now I need the average for each year.…

  r

  asked 7 years, 4 months ago Victor Oliveira 33