Data Viz Done Right

April 29, 2021

#WOW2021 Week 16 - How Do Sub-Category Sales Compare to the Sub-Category Average for Each Category?

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Lorna was being very kind with Workout Wednesday Week 16. The chart was pretty simple to build and the LOD required would have been easy enough to write (though I would have used a table calc). However, Lorna wanted us to get familiar with the Quick LOD feature that came out in Tableau 2021.1. Quick LODs are a super fast way to create FIXED level of detail expressions.

This workout required creating two quick LODs. So you have to think through the aggregations and adjust the default aggregation BEFORE creating the quick LOD. Here are my steps:

  1. Create a Quick LOD of Sales by Sub-Category by dropping Sales on top of Sub-Category (hold Command on a Mac while dropping). Since I left the default aggregation of Sales as SUM, this results in this LOD:

    { FIXED [Sub-Category]: SUM([Sales]) }

  2. Change the default aggregation of this new field to average. You have to do this so that at the Category level, you're getting the average of the sales across the sub-categories in each Category.

  3. Again, create the Quick LOD by holding Command (Control on a PC) and dropping the calc created in step 1 on top of the Category field. This is the resulting calculation:

    { FIXED [Category]: AVG([Sales (Sub-Category)]) }

I'll leave the rest of the calcs to you. Good luck!



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