How to read a bar chart
Bar charts categorize elements by size. They answer comparison questions: Which is largest? How do regions or products rank?
What is a bar chart?
A bar chart shows categorical data as rectangular bars. One axis lists the categories (regions, products, statuses); the other is a numeric scale. Bar length—horizontal or vertical—encodes the value. Vertical bars are often called column charts.
When to use it
Use a bar chart when you want to compare values across distinct categories and your data is categorical or discrete, not a continuous time series. It fits questions like "Sales by region?" or "Count by status?" Keep the number of categories manageable (roughly 5–15); for long labels use horizontal bars. If you need trends over time, use a line chart; for many categories or hierarchy, a table or treemap may work better.
How to read it
Check the axis labels: one axis is categories, the other is the scale. Longer or taller bars mean larger values. Use the title and legend for units and, with stacked or grouped bars, what each color means. If the value axis does not start at zero, differences can look exaggerated.
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