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Line Chart/X–Y Chart

Line charts are seen as simplified forms of the normal bar chart.
The bar chart given below represents the highest values of the sensex in the given years.
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If we convert the same data into a line chart, it will look like this:
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Sometimes in case of line charts, the lines are not given and only the dots are indicated in the graph. Let us see an example with the same data:
Description: 44267.png

Significance of Line charts

  • Generally Line charts are used in case time is one of the variables in the data. The ‘time’ variable can be in the form of hour, day, months years or anything that represents chronological order of events.
  • It is easier to calculate the percentage changes in a line chart and thereby understand the trends of the data in a better way.
  • A line chart becomes very handy in case of data with two different scales.
The line chart given below represents the production of soaps by a company over a period of five years and the inflation for the same period.
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  • Two or more than two variables can be represented on a line chart very easily. Besides, we can see the movement of data very easily in case of a line chart.
Below given line chart represents the movements of the highest value of two indices over a given period:
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The same data can be represented using dots only also:

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Types of Line Charts

Broadly, line charts are of three types:
Normal Line Chart
This is a simple line chart representing two or more than two variables.
In the chart given below, The total number of enrolments for four different years of for four coaching institutes are represented:

Description: 44230.png
Stacked Line Chart
In a stacked line chart, the values keep on getting added to obtain the next value.
Here, the bottom line (of LC) gets added with the values of SMI to represent the value of SMI. Now this represented value of SMI is added to the actual value of EMIT to give the value of EMIT on the chart. And finally, the same is done with the value of FC.

Description: 44220.png
Hence, in a stacked line chart, to obtain the values of different constituents/segments, either start with the top line or the bottom line and then keep on subtracting the values to obtain the next value.
Time-Speed-Distance Line Chart
This line chart is used in tables of data collected from experiments on physical processes.
Description: 44209.png

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