- It is one dimensional diagram. it is also known as pillar diagram or column graph. the height of the bar is proportional to the value of an element.
- when the variations are small this method is very effective. The vertical axis indicates the production of commodity while the horizontal shows various regions or time period.
- Method: -Find out the highest and lowest values of data. Accordingly select a scale. Plot the points that will determine the height of bars. draw pillars or bars upto the plotted heights.