1 Reply Latest reply on Apr 12, 2013 3:47 PM by Noah Salvaterra

    Scaling scatterplot markers to show uncertainty

    amanda baxter

      Hi, I've created a scatterplot with country on the x-axis and prevalence (%) on the y-axis. I'd like to use an upright cross as the marker, with the vertical line indicating uncertainty (eg where prevalence is 5.6%: the vertical ranges between 3.3 - 8.2%) while keeping the horizontal line a constant length. See example attached. I've tried to use the 'size' feature but this seems to draw on only one column of data, and increases the size of the entire marker (see example attached). Any suggestions much appreciated!Scatterplot example.png

      Thanks, Mandy

        • 1. Re: Scaling scatterplot markers to show uncertainty
          Noah Salvaterra

          I don't know of a way to do this simply with a symbol. What you're doing makes sense for +, it could get bad pretty fast with other symbols. If you use custom marks such as imported icons or images you generally want the proportions to be constrained.

           

          If just limiting the width would be sufficient (so there is no overlap between states) you could drag another copy of state on the columns shelf  (you can create a duplicate copy of the state dimension for this if you'd like to hide one of them). For small marks, you may still see a difference in the horizontal, but if all the marks are longer than the column it should work.

           

          The next thing I'd start to think about is a dual axis graph, tackling the vertical and horizontal segments individually, or maybe a polygon plot. Either would be more complex, and potentially introduce other issues, so I'm hoping duplicating state does the trick.