Graphical representation of data
- 1. Dr. V. Vadivel Assistant Professor PG & Research Department of Botany V.O. Chidambaram College Tuticorin – 628 008 drvvadivel@gmail.com
- 43. The line graphs are usually drawn to represent the time series data Example: Temperature, Rainfall, Population growth, Birth rates and the death rates.
- 44. • Simplify the data by converting it into round numbers. • Example • Growth rate of population shown in Table may be rounded to 2.0 and 2.2 respectively. • Draw X and Y-axis. • Mark the time series variables (years/months) on the X axis and the data quantity/value to be plotted (growth of population in per cent) on Y axis. • Choose an appropriate scale and label it on Y-axis. If the data involves a negative figure then the selected scale should also show it as shown in figure. • Plot the data to depict year/month-wise values according to the selected scale on Y-axis, mark the location of the plotted values by a dot and join these dots by a free hand drawn line.
- 46. Construct a line graph to represent the data as given in Table
- 48. • Polygraph is a line graph in which two or more than two variables are shown on a same diagram by different lines. • It helps in comparing the data. • Examples which can be shown as polygraph are: • The growth rate of different crops like rice, wheat, pulses in one diagram. • The birth rates, death rates and life expectancy in one diagram. • Sex ratio in different states or countries in one diagram.
- 49. Construct a polygraph to compare the growth of sex-ratio in different states as given in the Table Sex-Ratio (Female per 1000 male) of Selected Sates – 1961-2001
- 50. Polygraph