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Summary and Average

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    #16
    Re: Summary and Average

    Originally posted by trackmanpete View Post
    I came up with something different using basic Alpha technology (ie. default quick report with summary reports). Enclosed it the sample I was using....
    Pete

    Your $84.50 is the average of the $80 for line 1 and the $89 for line 2.

    It's not weighted to 10 items on line 1 and 1 item on line 2. So it is similar to the issue that was found initially...

    If you changed your formula to divide the total_price by the total_qty you would get a meaningful number...
    Al Buchholz
    Bookwood Systems, LTD
    Weekly QReportBuilder Webinars Thursday 1 pm CST

    Occam's Razor - KISS
    Normalize till it hurts - De-normalize till it works.
    Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
    When we triage a problem it is much easier to read sample systems than to read a mind.
    "Make it as simple as possible, but not simpler."
    Albert Einstein

    http://www.iadn.com/images/media/iadn_member.png

    Comment


      #17
      Re: Summary and Average

      I must be missing something or reading incorrectly.
      Are you and G saying you want $169/11?

      What I did was 10 x $8=$80 + 1 x $89 totals $169/2 sales records.

      The first approach would work using the Alpha Ave formula as I posted, if you created 10 separate records of $8 each and then added that along with the $89. This comes to $15.36. So, then the solution may be to create a calculation incorporating the third approach above, if that is the way you want to go.
      "Ollie, remember how dumb I used to be? Well, I'm much better now."

      Pete

      Comment


        #18
        Re: Summary and Average

        Originally posted by trackmanpete View Post
        I must be missing something or reading incorrectly.
        Are you and G saying you want $169/11?
        Yes
        Al Buchholz
        Bookwood Systems, LTD
        Weekly QReportBuilder Webinars Thursday 1 pm CST

        Occam's Razor - KISS
        Normalize till it hurts - De-normalize till it works.
        Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
        When we triage a problem it is much easier to read sample systems than to read a mind.
        "Make it as simple as possible, but not simpler."
        Albert Einstein

        http://www.iadn.com/images/media/iadn_member.png

        Comment


          #19
          Re: Summary and Average

          What I did was 10 x $8=$80 + 1 x $89 totals $169/2 sales records.
          No, that is not the correct avg.
          The correct avg would be $169/11.
          So, I would assume, there is no difference between v8 & v9.

          Comment


            #20
            Re: Summary and Average

            Originally posted by G Gabriel View Post
            So, I would assume, there is no difference between v8 & v9.
            Everything I did was in v9 and looks the same as previous versions..
            Al Buchholz
            Bookwood Systems, LTD
            Weekly QReportBuilder Webinars Thursday 1 pm CST

            Occam's Razor - KISS
            Normalize till it hurts - De-normalize till it works.
            Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
            When we triage a problem it is much easier to read sample systems than to read a mind.
            "Make it as simple as possible, but not simpler."
            Albert Einstein

            http://www.iadn.com/images/media/iadn_member.png

            Comment


              #21
              Re: Summary and Average

              I just figured out a simple way to fix this and this will be the basis for a UDF:
              1-Since alpha will divide the total by the number of the records, and
              2-Since we know what the total is,

              then

              To correct for true average becomes a simple formula:
              The avg given by alpha=total_price/# of records.
              So, if you multiply that number by the number of records then divide it by the quantity total, you will get the true average.
              All you have to do is get the number of records in each sub_groub, like Boston, MA and the formula would be as simple as:
              True_Avg=Avg*# of records/Quantity_total for sub_group.

              Hmmm!
              Why didn't I think of that earlier?

              Comment


                #22
                Re: Summary and Average

                Originally posted by G Gabriel View Post
                True_Avg=Avg*# of records/Quantity_total for sub_group.

                Hmmm!
                Why didn't I think of that earlier?
                That's a longer way around to the options that I showed in my examples.

                And with each calculation with a computer you introduce time increase (slight) and potential round off error, so do it as straight forward as possible...
                Al Buchholz
                Bookwood Systems, LTD
                Weekly QReportBuilder Webinars Thursday 1 pm CST

                Occam's Razor - KISS
                Normalize till it hurts - De-normalize till it works.
                Advice offered and questions asked in the spirit of learning how to fish is better than someone giving you a fish.
                When we triage a problem it is much easier to read sample systems than to read a mind.
                "Make it as simple as possible, but not simpler."
                Albert Einstein

                http://www.iadn.com/images/media/iadn_member.png

                Comment


                  #23
                  Re: Summary and Average

                  So I played with it some more in the reports on v9 and I think I was able to also get what each of you were after (just a Johnny come lately as a learning experience)
                  "Ollie, remember how dumb I used to be? Well, I'm much better now."

                  Pete

                  Comment


                    #24
                    Re: Summary and Average

                    Pete:
                    I haven't opened your zip file yet.
                    Obviously, the ways to get an average are numerous as sown in this thread (lets not forget tablesum()/tablecount() as well). The issue in this thread revolves primarily around getting the average in a summary operation. And as has been clarified, one must be aware of the limitation of this operation and the need to use some other means if you wish to get the weighted average.
                    The script I use is rather very simple and efficient:
                    It sorts the table according to the desired grouping
                    It runs through the records once, adding and lastly averaging values for simillar records.
                    Thanks to all.

                    Comment

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