Exploring and Analyzing Data37% of the exam
Combined axis and dual axis charts
Three ways to show two measures together: separate axes, a combined (blended) axis built from Measure Names and Measure Values, or a dual axis with two independent scales in one pane. Covers where to drop the measure, Synchronize Axis, and per-measure Marks cards for bar-and-line combo charts.
Create basic charts: Create a bar chart; Create a line chart; Create a scatterplot; Create a map using geographic data; Create a combined axis chart; Create a dual axis chart; Create a stacked bar; Create a density map; Create a chart to show specific values (crosstab, highlight table).
~7 min read · 4 practice questions ·
What the exam expects
- Choose between individual axes, a combined (blended) axis and a dual axis from the measures' scales and units.
- Create a combined axis by dropping a measure onto an existing axis, and name the changes Tableau makes with Measure Names and Measure Values.
- Create a dual axis by dropping a measure on the right side of the view, or with Dual Axis on the shelf field.
- Synchronize the two axes of a dual axis chart when they should share a scale.
- Build a combo chart, such as bars with a line, by changing the mark type on one measure's Marks card.
Key terms:
- Combined (blended) axis: one shared continuous axis for several measures, all marks in a single pane.
- Dual axis: two independent axes layered on top of each other in the same pane.
- Measure Values / Measure Names: generated fields holding all measure values (continuous) and all measure names (discrete).
- Combo chart: a view whose measures use customized marks, such as different mark types.
Key facts
Combined (blended) axis
- Detail
- Drop a measure or axis onto an existing axis
Blended axis field
- Detail
- Measure Values creates the shared axis
Measure Names when blending
- Detail
- On Color, and filtered to the blended measures
When to blend
- Detail
- Similar scale and units
Dual axis
- Detail
- Drop on the right side at the black dashed line, or Dual Axis on the field
Layered axes limit
- Detail
- Up to four: two on Columns and two on Rows
Synchronize Axis
- Detail
- Right-click the secondary axis; aligns it to the primary scale
Marks cards with several measures
- Detail
- One per measure, plus All
Measure Values / Measure Names
- Detail
- Continuous values / discrete names of all measures
- Why do Show Me's dual lines not share one value range like a blended axis?
- When does a measure dropped on the canvas create dual axes instead of a blended axis?
- How many layered axes can one view hold?
The questions are free to read. Answers with their sources and self-grading are included with the pack.
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