I am trying to perform a calculation which will divide the total value of a column for January 2014 (spread over a number of rows i.e. there may be 4 rows of data for January 2014 and I would like to take the total for Jan 2014), by the total value of another column for January 2014 ( there may be 2 rows of data for Jan 2014 here). Can somebody give me an example of how to create this formula?
Basically, the sum of the column for a particular month divided by the sum of a column for the same month (and have this work for every month).