Types of Graphs Types of Graphs Graphs are easy representation of showing data into the pictorial form. We can show the data representation with the help of several types of graphs. It is because we deal with many types of data so it is obvious to use different types of graph. With the help of graph we can easily understand the problem and find their solutions. To draw the graphs we have to follow the rules they are given below, these rules are for any two dimensional graph, 1.
On x - axis the independent variable will be there.
2.
On y -axis the dependent variable will be there.
3. It is not necessary that we define the axis from the origin point; our motive should be that all data must be covered on that axis which is given to us. 4.
Axis should be labeled.
5. We can also use the different colors and patterns when we have two or more data sets so that each and every data can be highlight.
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Let’s see the different types of graphs: Line graph: This graph shows how two variables are associated with each other and vary too. The line graph shows the one line representation that is x-y, where independent variable and dependent variable reside. It is used when we have the continuous data set. Pie charts: These types of graph can be shown in the form of circle. Because of this we also call this graph a circular graph. The circular graphs are divided into separate disjoint parts where each part shows the size of information. It is used when we have the categorical type of the data so that it can help to understand what percentage a particular part has. When we have two or more data set then representation becomes tough. Bar graph: In a bar graph, bars of uniform width are drawn with various heights. The height of bar represents the frequency of the corresponding observation. This is useful for the non continuous data. It is a bit different from other graph because on x axis the dependent variable will be there and on y -axis the independent variable will be there in the bar graph. Histogram: A histogram is graphical representation of the frequency distribution (in an exclusive form) in the form of rectangles with class interval as bases and the corresponding frequencies as heights there being no gap between any two successive rectangles. This graph is mostly used for the frequency distribution. Frequency polygon: Let x1, x2, x3 ......x n be the class marks (that is midpoints) of the given frequency distribution and let f1, f2, f3 ......f n be the corresponding frequencies. We plot the points (x1, f1), (x2, f2), (x3 , f3) ......(x n, f n ) on a graph paper and join these points by line segments.
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We complete the diagram in the form of a polygon by taking two more classes (called the imagined classes) one at the beginning and other at the end. This is known as the frequency polygon. Other graphs are- Scatter, Stem and plot, frequency curve and cumulative frequency.
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