Switching between Count and Percent with Parameter in Tableau

In one of the data visualizations I was working on I encountered a situation where I wanted to be able to switch between a display of the headcount and the percentage of people in categories. In researching the issue, I discovered that what I wanted to achieve could be done with the use of a parameter. The trick to get this to work was the use of custom formatting a measure to display positive and negative values differently, and then using a parameter to set the value being displayed.

Continue on to see the steps and an example of the feature in use…

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