# Economics

## Level 2: Diagrammatic Presentation Introduction Data may be presented in a simple and attractive manner in the form of diagrams. Diagrammatic presentation provides the quickest understanding of the actual situation to be explained by the data in comparison to the tabular and textual presentations. While making the diagrams, emphasis should be on: • Heading and number • Size and attraction • Width and Height • Scale • Scale measurement and index • Footnotes and source notes and • Simplicity Among the various kinds of diagrams some important ones are: • Geometric diagram • Frequency diagram and • Arithmetic line graph Geometric Diagram can be classified into: Bar Diagram and Pie Diagram Bar diagram is diagram in the form of a rectangle. The height or length of rectangle indicates the magnitude of data. It is also known as dimensional diagram. Bar Diagram can be classified as: • Simple bar diagram • Multiple bar diagram and • Component bar diagram Pie diagram is circular graph whose area is proportionally divided into sectors or components. It is also known as pie chart. It is very popular in practice to show percentage breakdowns. Frequency Diagrams are used to present Grouped frequency distributions. They are used in research work for the visual representation and analysis of the data. Frequency diagram can be further sub-divided into: • Histogram • Frequency Polygon • Frequency Curve and • Ogive Curve or Cumulative Frequency Curve In arithmetic line graphs (also called time series graph), time is plotted on X- axis and value of variable along Y-axis. There are two types of time series graph namely; one variable graphs and two variable graphs. Other important keywords: More Than Ogive, Less Than Ogive

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