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ABOUT THE PAGE

PageInfo

Formal introduction of Bar chart is given on this page as a part of DATA INTERPRETATION-DI section. Types of bar charts

are explained for data representation and data interpretation point of view. This introduction of Bar Charts section creates base for

Data Interpretation problems of three difficulty levels, viz- easy, medium and difficult- in the DI solved problems sections.

Browse Topics

1. Bar Charts

2. Simple Bar Chart

3. Composite Bar Chart

4. The Use of Bar Charts to Show Deviations

5. Representation of Percentage on a Stacked Bar Chart

6. Example

1. Bar Charts

Bar charts are one of the easiest, graphically attractive and hence most commonly used methods of presenting all types of data. They are especially useful for

representing various data series. The data series comprises the continuous variables while the values of the specific instances at which the value of the data

series is measured represents the values of the discrete variables.

Presentation of data as bar charts makes the comparative study of the data very easy. A bar chart consists of a group of bars which are equidistant from each

other. The values on the bar charts are read by the measurement of the length or the height of the bars. The width of the bars is largely inessential and is used

only for the clarity of the presentation.

Now lets have a look onto the different kinds of bar charts and the kinds of data that can be represented on a bar-chart.

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2. Simple Bar Chart

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Data Interpretation

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The simple bar chart is the simplest bar chart which has one continuous variable charted along with one discrete variable. Figure below shows an example of

Simple Bar Chart.

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3. Composite Bar Chart

One of the primary limitations of the simple bar chart is that it can only be used to display a single continuous variable. If two or more sets of continuous

variables are to be shown on the same bar chart, we use what is called a composite bar-chart. Figure below shows an example of the Composite Bar Chart.

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4. The Use of Bar Charts to Show Deviations

Deviation bars are useful for graphic presentation of continuous variables which can have both positive and negative values, i.e., surplus or deficit, net profit or

loss, net of imports and exports. In general continuous variables which have both positive and negative values are best represented on bar charts.

A base line is created and positive values (such as profit, surplus), etc., are represented by hers above the base line while negative deviations (loss or deficit)

are represented by bars below the base line as shown in the figure above.

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5. Representation of Percentage on a Stacked Bar Chart


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Sometimes stacked bars can also be used to represent the break-up of some continuous variable. Figure below will make it clear.

Such a use of bar charts is quite convenient for comparing two or more sets of data.

Figure below shows the break-up of the various sources of revenues for the Government of India over a two-year period.

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Example 1:

Answer the question based on the chart below.

Example 1.A:

In how many of the given years was the exports at least 10% more than the imports?

(A)0 (B) 1 (C)2 (D)3 (E)4

Solution:

In 1994, exports =80>70

10

100

(70)=77

in 1995, exports =130 We need not consider this year

In l997, exports =112>100+

10

100

(100)=110

In 1998, exports =170


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100

(150)=165

=> The given condition was satisfied in two years.

Choice (C) is the correct answer.

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Example 1.B:

What was the average exports for the given period (in 000 crores)?

(A)145 (B)132 (C)126 (D) 119 (E)138

Solution:

Average exports:

=(80+130+140+112+170+160

6

)=132

Thus choice (B)is the right answer.

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Example 1.C:

From 1995 to 1999, in which year was the percentage growth In exports, when compared to the previous year, the highest?

(A)1995 (B)1996 (C)1997 (D)1998 (E) 1999

Solution:

Export in a year exceeded that in the previous year in 1995, I996 and I998. Percentages by which exports in I995, I996 and 1998 exceed the exports in theprevious year were:

(50

80

)100%,(10

130

)100% and (58

112

)100% respectively.Only in I995 was the growth more than 60%

Thus choice (A) is the correct answer.

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Example 1.D:

What is the simple average annual growth rate in the imports from I994 to 1999?

(A)15 (B)18 (C)19 (D)21 (E)23

Solution:

Imports in 1994 (in 000 crores) = 70

Imports in 1999 (in 000 crores) = 150


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