Selecting the right chart is one of the most important steps in data visualization. A well-chosen chart helps your audience quickly grasp the key message in the data, while the wrong one can confuse or even mislead. The chart you choose should depend on the story you want to tell.

1. Comparison → Bar/Column Chart

When to use: To compare values across different categories (e.g., sales across regions, number of participants in different programs).
Why: Bar and column charts are intuitive and make it easy to see differences in size across groups.
Example: Comparing the performance of different departments in an organization.

2. Trend Over Time → Line Chart

When to use: To show how a value changes over time (e.g., monthly revenue, daily website visits).
Why: Line charts clearly highlight patterns, fluctuations, and long-term trends.
Example: Tracking the unemployment rate over the past 10 years.

3. Distribution → Histogram or Boxplot

When to use: To show how data is spread or clustered (e.g., ages of participants, income levels).
Why: Histograms reveal frequency patterns, while boxplots summarize spread, median, and outliers.
Example: Understanding the age distribution of survey respondents.

4. Relationship/Correlation → Scatterplot

When to use: To examine the relationship between two variables (e.g., hours studied vs. exam scores).
Why: Scatterplots show whether variables move together (positive correlation), move oppositely (negative correlation), or show no relationship.
Example: Plotting advertising spend against revenue to see if there’s a correlation.

5. Proportion → Pie or Donut Chart (use sparingly)

When to use: To show how a whole is divided into parts (e.g., budget allocation, market share).
Why: Pie and donut charts are visually appealing but can be hard to interpret when there are too many categories or when differences are small.
Better alternative: Consider a bar chart for clearer comparisons.
Example: Showing the percentage of total expenditure allocated to different departments.

Tip:

Always choose the chart that best aligns with your message, not just the data. Ask yourself:

Do I want to show growth or decline? (Line chart)
Am I comparing categories? (Bar chart)
Am I showing how values relate? (Scatterplot)
Am I exploring spread or variation? (Histogram/boxplot)
Am I illustrating parts of a whole? (Pie/donut chart, with caution)

The goal of a chart is not just to display data, but to make insights immediately clear.

M6:S4 - Choosing The Right Chart for the Data

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