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Want numbers to speak? Excel chart data combo
In daily report production, it's common to create charts for multiple indicators. For example, when dealing with sales data, you might want to use a bar chart to represent sales volume and a line chart to show the growth rate. Traditionally, this would require creating two separate charts, which can take up too much space in a document and make it difficult to compare both metrics at once. Fortunately, Excel now allows you to combine these charts into one, making the visualization more efficient and easier to read.
One simple way to do this is by overlaying charts. Let’s say you have sales data and growth rate data. First, prepare your raw data. Then, select all the data and go to “Insert → Chart → Column Chart → Combination Chart → Clustered Column Chart.†This will create a combined chart where the sales volume is displayed as bars and the growth rate as a line. The two charts are automatically grouped, allowing for an intuitive comparison of both metrics (Figure 1).
You’ll notice that the line chart uses a secondary axis to display the growth rate. To make the trend more visible, you can adjust the right-axis scale so it’s separated from the bar chart. Right-click on the right axis, choose “Format Axis,†and set the minimum and maximum values accordingly (e.g., -1.5 to -1). This helps visually distinguish the line chart from the bar chart (Figure 2).
To enhance readability, you can add data labels to the line chart. Right-click on the line, select “Add Data Labels,†then go to “Format Data Series†and choose the dot mark to connect the points. This makes it easier to track changes in the growth rate over time (Figure 3).
Excel also offers various built-in combination charts. For instance, when representing percentages, a pie chart is often used. However, if a category has small data, it may not be clearly visible. A composite pie chart can solve this by grouping smaller categories together. After selecting the data, go to “Insert → Chart → Pie Chart → Composite Pie Chart†to view the data in a stacked bar format (Figure 4).
Customizing the composite chart is straightforward. Right-click on the chart, choose “Format Data Series,†and under “Category Splitting Basis,†you can select either “Value†or “Percentage†to control how the data is segmented (Figure 5).
While Excel’s built-in combination charts are useful, they sometimes have limitations. For example, a composite pie chart may not always effectively show differences between data points. To overcome this, you can manually combine a pie chart with a bar chart. Start by creating the composite pie chart, then insert a bar chart using the same data. Customize the colors to match the pie chart and remove unnecessary elements like the legend or axis labels (Figure 6).
Once the bar chart is ready, move it onto the pie chart and adjust its size to fit. Then, group both charts together by selecting them and clicking “Format → Group.†This creates a unique “pie + column†chart that isn’t available in Excel’s default options, offering better clarity for comparing data (Figure 7).
For more complex scenarios, such as displaying quarterly sales data across provinces, Excel’s standard stacked charts may not be sufficient. To improve visibility, you can add auxiliary columns. For example, insert a new column after the existing data and enter a formula like “=100-C2†to calculate a base value. Repeat this process for other quarters to ensure each bar starts at a consistent point (Figure 8).
After setting up the auxiliary columns, select all the data and go to “Insert → Recommended Charts → All Charts → Column Charts → Stacked Columns.†Choose the appropriate series and set their fill color to “None†for the auxiliary columns. This creates a clean, stacked chart that clearly shows the differences in sales across quarters (Figure 9).
By combining different chart types and customizing them, you can create powerful visualizations that convey complex data in a clear and concise manner. Whether you’re working with sales data, growth rates, or percentages, Excel provides flexible tools to help you present information effectively.