Combo charts (bar + line) in Tableau - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a combo chart in Tableau?

A combo chart combines two chart types, usually bars and lines, in one view to show different data measures together for easy comparison.

beginner

Why use a combo chart instead of separate charts?

Combo charts let you see relationships between two measures in one place, saving space and making it easier to compare trends and values side by side.

intermediate

How do you create a combo chart in Tableau?

Drag one measure to Rows and another to Rows or Columns, then change the mark type of one measure to Line and the other to Bar. Use the dual axis feature to overlay them.

intermediate

What is the purpose of the dual axis in a combo chart?

Dual axis lets you overlay two different chart types on the same graph area, aligning their scales so you can compare them directly.

intermediate

What should you consider when choosing measures for a combo chart?

Choose measures with different units or scales that complement each other, like sales amount (bars) and profit margin (line), so the combo chart tells a clear story.

What chart types are commonly combined in a Tableau combo chart?

A Pie and Scatter

B Bar and Line

C Histogram and Map

D Tree Map and Gantt

Combo charts usually combine bar and line charts to show two measures together.

Which Tableau feature allows overlaying two charts in a combo chart?

A Highlight

B Filter

C Dual Axis

D Parameter

Dual Axis overlays two charts by aligning their axes.

When creating a combo chart, what do you change to show one measure as a line?

A Mark type

B Filter

C Color

D Tooltip

Changing the mark type to Line displays that measure as a line.

Why is it important to choose measures with different scales for a combo chart?

A To reduce the number of data points

B To confuse the viewer

C To avoid using colors

D To make the chart easier to read and compare

Different scales help show distinct measures clearly in one chart.

What is a key benefit of using combo charts in dashboards?

A They save space and show relationships between measures

B They replace all other charts

C They only show one measure

D They require no data preparation

Combo charts save space and help compare measures easily.

Explain how to build a combo chart in Tableau step-by-step.

Think about how to show two different chart types together.

Describe when and why you would use a combo chart in a business dashboard.

Consider the story the data tells when combined.

Practice

1. What is the main purpose of a combo chart in Tableau?

easy

A. To filter data based on categories

B. To create a pie chart with multiple slices

C. To show only one measure as a bar chart

D. To display two different types of data using bars and lines together

Solution

1. Step 1: Understand combo chart definition

   A combo chart combines two chart types, usually bars and lines, to show different data types together.

2. Step 2: Identify the purpose in Tableau

   In Tableau, combo charts help compare two measures visually by using bars for one and lines for another.

3. Final Answer:

   To display two different types of data using bars and lines together -> Option D

4. Quick Check:

   Combo chart = bars + lines [OK]

Hint: Combo charts mix bars and lines to compare two data types [OK]

Common Mistakes:

• Thinking combo charts show only one measure
• Confusing combo charts with pie charts
• Believing combo charts filter data

2. Which step is necessary to create a combo chart in Tableau?

easy

A. Use dual axis and set different mark types for each measure

B. Create a calculated field with IF statements

C. Apply a filter to exclude null values

D. Use a single axis with one mark type

Solution

1. Step 1: Identify how to combine bars and lines

   To combine bars and lines, Tableau requires dual axes so each measure can have its own scale and mark type.

2. Step 2: Set mark types for each axis

   After dual axis, set one axis to bar marks and the other to line marks to create the combo effect.

3. Final Answer:

   Use dual axis and set different mark types for each measure -> Option A

4. Quick Check:

   Dual axis + mark types = combo chart [OK]

Hint: Dual axis + different marks = combo chart in Tableau [OK]

Common Mistakes:

• Trying to use one axis for both bars and lines
• Confusing filters or calculations with combo chart setup
• Not setting mark types separately

3. Given a combo chart with Sales as bars and Profit Ratio as a line, what happens if axes are not synchronized?

medium

A. The chart will show an error and not render

B. The line and bars may appear misaligned, confusing interpretation

C. The bars will disappear but the line remains

D. The line will convert to bars automatically

Solution

1. Step 1: Understand axis synchronization

   When axes are not synchronized, the scales differ, causing bars and lines to not align properly.

2. Step 2: Effect on visualization

   This misalignment makes it hard to compare values visually, confusing the viewer.

3. Final Answer:

   The line and bars may appear misaligned, confusing interpretation -> Option B

4. Quick Check:

   Unsynced axes = misaligned chart [OK]

Hint: Always sync axes to align bars and lines clearly [OK]

Common Mistakes:

• Expecting an error instead of misalignment
• Thinking bars or lines disappear
• Assuming automatic mark type changes

4. You created a combo chart but the line chart is not visible. What is the most likely cause?

medium

A. The second axis is not added or dual axis is not enabled

B. The data source has no values for the line measure

C. The bar chart is overlapping the line chart due to mark size

D. The filter excludes all data points for the bar chart

Solution

1. Step 1: Check dual axis setup

   If the line is missing, often the second axis for the line measure was not added or dual axis was not enabled.

2. Step 2: Confirm mark types and axes

   Without dual axis, Tableau cannot overlay line and bar marks properly, so the line won't show.

3. Final Answer:

   The second axis is not added or dual axis is not enabled -> Option A

4. Quick Check:

   Missing line = no dual axis [OK]

Hint: Enable dual axis to show both bars and lines [OK]

Common Mistakes:

• Assuming data is missing without checking axes
• Blaming filters for line missing
• Not verifying mark types

5. You want to create a combo chart showing monthly Sales as bars and cumulative Profit as a line. Which steps should you follow?

hard

A. Use a pie chart for Sales and a line chart for Profit on the same axis

B. Create cumulative Profit bar chart, add Sales as line on single axis, no synchronization needed

C. Create Sales bar chart, create cumulative Profit calculated field, add Profit as line on dual axis, synchronize axes

D. Create Sales and Profit as separate charts, then combine in dashboard without dual axis

Solution

1. Step 1: Prepare measures

   Create a bar chart for Sales and a calculated field for cumulative Profit to show running total.

2. Step 2: Build combo chart

   Add Sales as bars and cumulative Profit as a line on a dual axis, then synchronize axes for clear comparison.

3. Final Answer:

   Create Sales bar chart, create cumulative Profit calculated field, add Profit as line on dual axis, synchronize axes -> Option C

4. Quick Check:

   Dual axis + cumulative calc + sync axes = correct combo [OK]

Hint: Use dual axis and cumulative calc for combo charts with running totals [OK]

Common Mistakes:

• Not creating cumulative calculated field for Profit
• Skipping axis synchronization
• Using single axis for different scales