The transformation of data through visual methods, like graphs, diagrams, maps and charts is called the graphical representation of data. There are some general rules for drawing graphs, diagrams and maps. These are: Selection of a suitable method Selection of a suitable scale and Design Line graphs are drawn to represent the time series data, such as temperature, rainfall, population growth, birth rates, death rates etc. Polygraph is also a line graph in which two or more variables are shown by an equal number of lines for comparison. For example, the growth rate of different crops in different states or countries. Simple bar diagrams are constructed for an immediate comparison. The line and bar graphs drawn separately can also be combined to depict the data related to some of the closely associated characteristics. Multiple bar diagram is constructed to represent two or more than two variables for the purpose of comparison. In the Compound bar diagram, different variables are shown in a single bar with different rectangles. Pie Diagram is also known as divided circle diagram. In this diagram the total value of a given attribute is shown, using a circle. Flow diagrams are used to show the flow of commodities or people between the places of origin and destination. Thematic maps are drawn to show a particular theme. They can be quantitative and non-quantitative. Some of the quantitative thematic maps are: Dot maps Choropleth map, and Isopleth maps

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