How to make a Parliamentary chart with Tableau Desktop

The beginner on Tableau Desktop will quickly be struck with a paradox: while he/she can easily build quite elaborate charts, a few trivial issues cannot be solved but with calculations of disproportionate complexity. A good example is the Parliamentary chart, customarily used to display political forces in an elected assembly. For instance, a web research will get you charts displaying each individual seat, with plenty trigonometric formulas. The result is beautiful, but quite hard to achieve!

I would like to present here a simpler method, considering the Parliamentary chart as a half-pie. As it is not that obvious, it is an excellent example to discover some advanced Tableau features, or to go deeper into them, more particularly LOD expressions and Table Calculations.

This tutorial is for all those who already have a first experience with Tableau. If you are a false beginner, you will learn many aspects and practices never even heard. If you are a seasoned Tableau developer, you will find commensurate challenges.

To make it more amusing, this practical case is organized as a series of exercises, with of course the detailed solution to each. The complexity of each question is specified by asterisks (* = easy, ** = moderate, *** = hard), you can sum up you score!

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