Representations of data

Previously we have discussed about differential equations formulas and In today's session we are going to discuss about Representations of data which comes under cbse 12th syllabus, It means presenting the data in form of graphs, diagram, maps or chart besides the tabular form. In this type of representation of data, visualization is provided in forms of graphs and charts. There are some basic needs for the representation of data:

. Sometimes it is difficult to understand the descriptive data as it is not easy to draw the results.

. Easily draw the visual impression of the data

. Makes comparison easy

. Characteristics can be represented in a simplified way

. Some kind of patterns are made easy as population growth or distribution and density or age – sex composition , etc .

There are some rules that must be followed before designing the graphs,charts or diagrams

1. first of all a suitable graphical method is selected .

    
        Then after selecting the graphical method a scale is selected that is suitable to the data
        On the basis of Title,Index and Direction design must be followed.

There are several diagrams that are used for representing the data that can be categorized

in the following types :

. Some examples like Line graph, polygraph, histogram, pyramid and bar diagram etc. examples of One dimensional diagram.

. There are rectangular diagram and pie diagram examples of Two dimensional diagrams.

. Diagram as cube and spherical diagram examples of Three dimensional diagram.

Representation of data are done in many ways that are flow chart,line graphs,bar diagrams,pie diagrams , wind rose and star diagram etc .These are some examples of popular diagrams that are mostly used in representing the data.

Rainfall,Population growth,Temperature are examples of series of time, For representing the series of time e and series like birth rates and death rates etc are represented by drawing the Line graphs .

Two or more variables on a same diagram is represented by a Polygraph that is also a line graph ,that are shown by different line as example for showing the growth rate of different crops and These diagrams are also used for show the birth and death rates .

So there are different types of graphs and diagrams that are used for show the different type of representing data .In the next session we are going to discuss Sampling techniques.

In the next session we will discuss about online math tutor and You can visit our website for online tutoring for free.