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Calculated field help

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    Calculated field help

    I need a bit of help with a calculated field expression. I am analyzing a table of contract billing records. I have a report with a group break on serial number. For each serial number, I would like to average the contract billing rate over a given time frame. In other words, a given serial number typically has 12 billings per year, and might have 3 years of billings. I would like to calculate the average billing rate for each year, for each unique serial number, and present this information on a report (I am trying to see how contract billing rates are trending). The "average" function is a likely candidate, but I can't figure out how to limit this to averaging over a date range for each group member. Any help is greatly appreciated.

    #2
    RE: Calculated field help

    Jeff,

    Look at the dbavg() and tableavg() functions. Depending on the number of records in your table, you may want to use dbavg() and have some indexes defined.

    what is not clear from the examples in the documentation is that the third term in dbavg() "keyvalue" can be a variable or the value in a field in the current record.
    There can be only one.

    Comment


      #3
      RE: Calculated field help

      Jeff:

      A simple way is to create a Character field in your table called "Year" Set the field rule for this field to be calculated, then enter "CYEAR(Bill_Rate)(or whatever the name of the field is that stores the invoice date. Run the re-evaluate rules to update the field.

      Your report then will need two group breaks. The first on "Serial" the second break on Year. You can use the quick report feature to build the basic report which will give you the total for the year by serial number. In the report create a calculated field with the following properties: AVERAGE(Bill_Rate, GRP->YEAR). This will give you the average per year per serial number.

      Final output should look some like this:

      Serial Number (1st Group)
      Year (2nd Group)
      Bill Rate 1st Month (This is the Detail Section)
      Bill Rate 2nd Month

      Total Bill Rate Average Bill Rate (Cal Field Here)
      Year 2

      Etc.

      Once you get it running and are confident in the numbers you can remove the detail and drop your year header to the footer and get rid of the year header. This just cleans it up a little.

      Hope this helps. I build a quick one and it works fine.

      Bob Fishell







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