Q.Distinguish between a simple bar diagram and a sub-divided (component) bar diagram.
A simple bar diagram represents a single variable across different categories or time periods — each bar's length shows just one value, e.g., a state's total revenue for each of five years, one bar per year.
A sub-divided (component) bar diagram is used when each total can itself be broken down into parts — the bar representing the total is divided into segments, with each segment's length proportional to its share of that total, e.g., a household's total monthly expenditure for a year shown as one bar, itself split into food, rent, education and savings segments.
| Basis | Simple Bar Diagram | Sub-divided Bar Diagram |
|---|---|---|
| What each bar shows | A single value | A total, broken into its components |
| Best suited to | Comparing ONE variable across categories | Showing both a total AND its composition together |
| Reading it | Compare bar lengths directly | Compare total bar lengths, and also compare segment sizes within/across bars |
A simple bar diagram shows one value per bar; a sub-divided bar diagram shows a total per bar, split into components proportional to their share.
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