Bar graphs are generally used in Statistics to depict data, these are the chart or graph which contain rectangular bars. Bar graphs can be considered as vital concepts of statistics. Here we will see how to make a Bar Graph These types of graphs are often used to show nominal or categorical data. The categorical data is the data which have no order and is purely arbitrary. The points to remember while plotting a bar graph are: All bars should have same thickness, same distance is there between two consecutive bars, bar graphs are considered to be more appropriate when each item of data is separated from each other, bars may be vertical or horizontal. The types of bar graph are simple bar graph, double bar graph, divided bar graph.
They can be further classified as single bar graph, grouped bar graph and stacked bar graph. Single bar graph simply represents the discrete value of item for every single category which is shown on opposite axis.
If we have discrete value for more than one item which share same category then they are called clustered or grouped bar graphs.
Stacked bar graphs are divided into subparts which show discrete value of item for representing a portion for whole group. Though statisticians use various bar graphs for different data to present them in appropriate manner.
Bar graphs are quite easy to plot and easy to understand. Below explained is a bar graph in which at y-axis represents demand per week and 'x' axis represents change in price of commodity. Simple bar graph are easy to understand and are
easy to plot.
Price here is in dollar when the price of commodity “x” was $1 then demand was 55 units and at 2 $ demand is 80 units and so on.