Creating visuals with variable dimensions
- Open a new dashboard.
 - Click New Visual.
 - Select the US County Population dataset in the Data menu.
 - Select the Bar Chart visual type in the Visuals menu.
 - 
        Populate the shelves of the visual:
        
- From Dimension, select and move 
Stnamefield to the X Axis shelf. - From Measures, select and move 
Tot Popfield to the Y Axis shelf. On the Y Axis shelf, change the aggregation of the Tot Pop field from
sum(Tot Pop)toavg(Tot Pop): selectTot Popfield, chose the Aggregates menu, and change the aggregate from Sum to Average.- On the Y Axis shelf, click 
Tot Pop, and under the FIELD PROPERTIES menu select Order, and choose Ascending. 
           - From Dimension, select and move 
 - 
        Click REFRESH VISUAL to see the basic set up of the bar
          chart.
        
           - 
        On the X Axis shelf, click 
Stnamefield. - 
        In the FIELD PROPERTIES menu, select [ ] Enter/Edit
            Expression.
        
           - 
        In the Enter/Edit Expression modal window, change the text to
          the following expression: 
<<dim:[Stname]>>. - 
        Click VALIDATE & SAVE.
        
           - 
        Change the name of the visual to Population by <<dim>>.
        
To have an informative title for the visual, you may add the parameter placeholders to it. The filter configured in Creating filters to control variable dimensions supplies the required value.
 - Click SAVE.
 
