In this Skillpill, you will learn how to create a Parliament Chart in Tableau.
A Parliament Chart, or semicircular chart, represents the distribution of parliamentary seats. It is not a standard chart type in Tableau but can be manually created using calculations and customizations.
This type of chart is ideal for visualizing proportional distributions, such as parliamentary seats, votes, or other categories, in a way that is engaging and appealing.
→ Start by preparing your data and ensure it’s in a format that includes, in this case: the party and the number of seats occupied by each
Next, create several calculated fields that will help correctly display the data, i.e., the members on the semicircular parliament layout:
→ Calculated field INDEX with the formula: INDEX() - 1
→ Calculated field Total (total number of members) with the formula: {FIXED : COUNTD([Seat #])}
→ Calculated field Item with the formula: INT(INDEX / Rows)
→ Calculated field Steps, which account for the half-circle representation, with the formula: 180 / (MAX(Total) / Rows - 1)
→ Calculated field Distance with the formula: (INDEX % Rows) + Rows from Center
→ Calculate the X and Y coordinates using the following formulas:
X Coordinate: COS(RADIANS(Item) * Steps) * Distance Y Coordinate: SIN(RADIANS(Item) * Steps) * Distance
Here, you can view the result in Tableau Public:
Watch the video tutorial here:
About btProvider:
We hold all possible technical and sales certifications for all products:
Tableau Desktop, Tableau Public, Tableau Server, Tableau Prep, and Tableau Data Management.
With Tableau Software – the best data visualization platform – you can always understand your business or your job better. Using Tableau, you will make intelligent and strategic decisions and quickly understand the data flow, numbers, and the results it produces. See other #skillpill video tutorials here:
How to display multiple insights on a dashboard in #Tableau
How to create Stacked Bars on Grand Totals in Tableau
How to create a Buffer Zoom in a Tableau Map
Are you interested in learning more about Tableau Software – one of the best analytics tools and implementing the solution in the entire company?
See how Tableau works, by downloading a free trial here:
Three of Southeast Europe’s most respected technology companies: Next Consult, btProvider, and C4 Nexus, today announced their Strategic Alliance under a bold new brand: Trimaranix.
What the most forward-thinking executives are discovering is that AI integration isn’t just a technology project. It’s a full-scale evolution of how organisations think, operate, and compete,
Agentic AI can increase efficiency but brings new challenges. It needs strong data security, transparent decision-making, and clear accountability. It also changes how people work.
