Diagrams and Graphs
*Diagrams are dimensional forms of presentation. Diagrams give a bird’s eye view of the data. They are visually attractive hence they have great memorization value compared to figures.
Principles of diagram construction
- Should have a title
- Suitable scales should be on the x and y axis
- A key should be provided where necessary to explain all the symbols used.
- The diagram should be clean and neat.
TYPES OF DIAGRAMS/ GRAPHS
- Simple/single bar charts
- Multiple bar charts
- Component bar charts
- Line graphs/ Histograms
- Lorenzo curve
- The current data graph
- The cumulative graph
- The moving annual graph
*Lorenzo Curve shows disparity in proportions as common in the distribution of economic goods such as distribution of income in a population, the distribution of land, profits and so on.
*Z-chart is used to present data that varies seasonally such as rainfall. It consists of three 3 graphs and when drawn resembles the letter Z