I'm fairly new using QlikView and I have a question about how can I add a variation line in a bar chart. I now that there is an option of a mix chart and on expressions I have to add the variation formula.
The issue is that I have a bar chart of exportations (for example) and it show the tons exported month by month, I mean it show jan-13, jan-14, feb-13, feb-14.... and what I would like is to show a variation between jan-14 and jan-13 and the same for the other months. I tried with expressions such as "=sum(Tons)/above(sum(Tons))-1" but it doesn't work. I don't know how to make the difference between jan-14 and jan-13.
Would anybody have any suggestions to my questions and where to go to learn the basics concepts of the type of programming I might need.
