Tableau QT: Thermometer Chart

Toan Hoang

5 years ago

This is a Quick Tip on how to build a Thermometer Chart in Tableau, so less reading and more jumping in. We are going to spend 5 minutes or less building our Thermometer Chart in Tableau.

Note: As always never choose a data visualisation type and try to fit your data into it, instead, understand your data and choose the best visualization for your data consumers.

Data

Load the following data into Tableau Desktop / Public.

Country,Path,Value
United States,1,0.9
United States,101,0.9
Canada,1,0.5
Canada,101,0.5
United Kingdom,1,0.7
United Kingdom,101,0.7
France,1,0.3
France,101,0.3

Note: we require path and duplicate lines for densification. See our tutorial on Data Densification for more information. Click here

Calculations

We will start by creating the following calculated fields.

Path (bin)

Right-click on Path.
- Go to Create, and select Bins…
- In the Edit Bins window:
  - Set New field name to Path (bin).
  - Set Size of bins to 1.
  - Click OK.

Index

INDEX()-1

TC_Value

WINDOW_MAX(MAX([Value]))

TC_Thermometer

[Index]*[TC_Value]

TC_Size

IF [TC_Thermometer] = 0 THEN
    1
ELSE
    0
END

TC_Size (Background)

IF [TC_Thermometer] = 0 THEN
    1
ELSE
    0
END

TC_Color

IF [Index]/100 < [TC_Value] THEN
    [Index]
ELSE
    NULL
END

Calculated Fields

Now that we have created our Calculated Fields, we will build our Worksheet.

Change the Mark Type to Line.
Drag Country onto Columns.
Drag Path (bin) onto Rows.
- Right-click on this object and ensure that Show Missing Values is selected.
- Drag this object onto the Path Mark.
Drag TC_Thermometer onto Rows.
- Right-click on this object and select Edit Table Calculation.
- Under Nested Calculation select Index.
  - Under Compute Using select Specific Dimensions.
  - Check Country and Path (bin) and ensure that Country is on top.
  - Set At the level to Deepest.
  - Set Restarting every to Country.
- Under Nested Calculation select TC_Value.
  - Under Compute Using select Specific Dimensions.
  - Check Path (bin) only.
Drag TC_Size onto the Size Mark.
- Right-click on this object, go to Compute Using and select Path (bin).

If all goes well, you should see the following:

Now, we will add a background shape

Drag Index onto Rows to the left of TC_Thermometer.
In the Index Mark Panel, replace the TC_Size with TC_Size (Background).
Right-click on the TC_Thermometer in Rows and select Dual Axis.
Right-click on the TC_Thermometer Axis Header and select Synchronize Axis.

You should now have the following:

Now we will adjust the cosmetics:

Hide the headers.
Set Row Divider to None.
Set Column Divider to None.
Set Zero Line to None.
Set Grid Lines to None.
Adjust the Size of TC_Size.
Adjust the Size of TC_Size (Background).
Adjust the Color.
Add a Tooltip.
Add a Label.

You would like to end up with the following data visualisation.

and boom, we are done, nice, simple and quick. You find my Waterfall Chart Dashboard on Tableau Public at
https://public.tableau.com/profile/toan.hoang#!/vizhome/ThermometerCharts/ThermometerCharts

Summary

I hope you all enjoyed this article as much as I enjoyed writing it. Do let me know if you experienced any issues recreating this Visualisation, and as always, please leave a comment below or reach out to me on Twitter @Tableau_Magic.

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Also, do be sure to check out our various courses:

Creating Bespoke Data Visualizations (Udemy)
Introduction to Tableau (Online Instructor-Led)
Advanced Calculations (Online Instructor-Led)
Creating Bespoke Data Visualizations (Online Instructor-Led)