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I created a selection menu for countries based on a parameter (see my viz MM2018Wk14_Wine.  I wanted to exclude World Total from the selection menu since I have it filtered out of my line chart.  I went to Edit Parameter then scrolled to World Total and excluded from the parameter list.  Now it's gone from the menu. 

I couldn't remember how to calculate the difference from the previous year - thought it was a table calculation, but couldn't find how to get to it. 

 

I had my measure in the Row Shelf.  I right clicked that pill and it pulled up "Add Table Calculation" in the choices.  From there I was able to set up the calc field to calculate difference from the previous year.