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calculated percentages

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    calculated percentages

    I am trying to work with test scores in terms of getting a percent change function to show up. I can get the change calculated OK...post test minus pretest....but I can't get the result expressed as a percentage. I tried post test minus pretest divided by pretest for the percent change. No deals. I tried (posttest-pretest)/prestest. No deals. I tried to divide the calculated results of posttest-pretest after that number is posted to a field by setting up yet another calculated field - change/pretest. No deals.

    I looked in the numeric functions and although I could find the cosine of the square root of the largest of two prime numbers inverted and the resulting investment detail, I can't find a way to do a simple percentage.

    I know I'm not looking in the right place, but I can't find a reference to percentages in the getting started or action scripting manuals. I tried setting up the change field as a variable and then dividing the variable by the pretest...no deals.

    I've set the decimals in the field to two. The closest result I have gotten is a minus 1. This has to be a common need...calculating percentages...but I'm not seeing the solution yet.

    #2
    RE: calculated percentages

    Whoops. Asked for help too soon. I finally figured it out. Happy Thanksgiving to one and all.

    lt

    Comment


      #3
      RE: calculated percentages

      Please share. Might help the next guy (or gal). -- t

      Comment


        #4
        RE: calculated percentages

        OK - Good suggestion. First I created a numeric field for the pre-test score. Then another for the post-test score. Then I created a calculated field to post the difference between pre and post tests. I created these fields in the table design/field structure mode and the field rules mode.

        Then, in the form design window, I created a new variable field using the drag and drop which allowed me to create
        a variable that divides the number in the calculated field by the pre test score and then drag this field into the form.

        This gives me the percentage of change as related to the pre test. It posts as a decimal and that's fine for my purposes.

        And, by the way, in reading thru the forum looking for ideas, I ran across a rather long, but extremely accurate (based on my experience)discussion of the learning curve.

        It is clear to me that my frustrations were to be expected because I had no prior knowledge of database design. (And still don't have much of a grasp in terms of relationships between various tables. Thanks to all who have helped me with those structural matters.)

        Anyhow, I think it would be useful to have some sort of access to information on database fundamentals for people new not only to A5 but also to the whole world of databases.

        Or pointers to a list of informational materials etc. But for sure, everyone needs to read that treatise before they get too frustrated.

        And again, thanks for all the advice and patience with me as I've struggled to learn.

        lt

        Lanny

        Comment


          #5
          RE: calculated percentages

          Whoa...misinformation alert. In the previous note I mentioned that I created a variable field for the percentage calculation. Wrong. It is a calculated field. But, still, the important thing is that the field I tried to create in the table design mode didn't work while the field I created in the form design mode did. Someone will know why it works one way but not the other to create this field that essentially takes the product of another calculated field and runs a calculation on it, but I don't. I only know that it does work.

          lt

          Comment


            #6
            RE: calculated percentages

            Whoa...misinformation alert. In the previous note I mentioned that I created a variable field for the percentage calculation. Wrong. It is a calculated field. But, still, the important thing is that the field I tried to create in the table design mode didn't work while the field I created in the form design mode did. Someone will know why it works one way but not the other to create this field that essentially takes the product of another calculated field and runs a calculation on it, but I don't. I only know that it does work.

            lt

            Comment


              #7
              RE: calculated percentages

              Lanny

              You write:

              "Anyhow, I think it would be useful to have some sort of access to information on database fundamentals for people new not only to A5 but also to the whole world of databases.

              Or pointers to a list of informational materials etc. But for sure, everyone needs to read that treatise before they get too frustrated. "


              I agree with you.

              There has been some discussion of this point but I wonder how many neophytes would consult such material. I find people to be extremely resistant to reading documentation.

              Frustration may therefore be a necessary precondition to enlightenment. (Personally, I love documentation but I know I am atypical.)

              I think a short bibliography of recommended readings could be added to FAQ list. The question might be, "What can I read to help me set up my application correctly?"

              Bill
              Bill Hanigsberg

              Comment


                #8
                RE: calculated percentages

                Well, somewhere between the level of frustration that overwhelms and the level that seems manageable is a good aiming point, I think. And the notion of a bibliography seems like a good addition. Your point on documentation is certainly valid. It is tough to face a X hundred pages of manual when what you think you need is an example of a single item that's bugging you. But then, the forum takes up a lot of that slack - if you have acquired the vocabulary to ask the right question.

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