2 Replies Latest reply: Oct 4, 2011 6:03 AM by nessinot RSS

    Average in line chart

      I have the following simplified dataset:

       

       

      LOAD * INLINE [
          Week, Salesrep, #Visit
          1, Hank, 2
          1, Hank, 1
          1, John, 3
          2, Pete, 3
          2, Hank, 1
          3, John, 2
          3, Hank, 4
          3, Pete, 12
          4, Pete, 1
          4, John, 1
          4, Hank, 7
      ];
      
      


      This indicates per week how many visits a salesrep has done.

       

      I have created a line chart with an average number of visits per week. In the options of the expression you can select the average trendline to be displayed. I would like to give this line a different look.

       

      That is the reason I have created a second expression that calculates the average. Unfortunately I cannot get my calculated line to match the trend line.

       

      See the image below for an impression:

      Linechart.JPG

      You can see the Visits line in blue and the corresponding trendline. In red the Avg line is just below that.

       

      The table below displays the numbers that correspond to the chart.

       

      Table.JPG

       

      The Visits trendline corresponds to ((6 / 2) + (4 / 2) + (18 / 3) + (9 / 3)) / 4 = 3.5

      The Avg trendline corresponds to 37 / 3 / 4 = 3.083

       

       

      See attached qvw file for the formula's I used. I would like to have a formula for the Avg expression that enables me to get the same result as the trendline. I must be missing something really easy here, but I just can't get it to work...