Defining Subsets of Your Data
Defining subsets of your data helps you to filter some of the interesting points in your dataset and visualize it individually or compare it with the rest of the dataset. Generally, there are two types of sets in the Tableau Desktop known as:
Dynamic subsets: the members of a dynamic set change when the underlying data changes. Dynamic sets can only be based on a single dimension.
Fixed subsets: the members of a fixed set do not change, even if the underlying data changes. A fixed set can be based on a single dimension or multiple dimensions.
Dynamic subsets
In order to create dynamic subsets, right click on any dimension in the Data pane and choose Create --> Set.
Now, let's use these defined sets in our visualization. For example, drag and drop the County Set 3 that was created by choosing the top 5 counties due to number of cases of COVID-19 into the markers. The first mode of visualization by using sets is called IN/OUT which means the IN category shows the visualization of members that are included in the set and OUT category shows the visualization of members that are excluded from the set. You can choose this mode by clicking on the County Set 3 in the markers section.