Presentation of Statistical Data – Part 2
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Bar Charts or Diagrams
Bar diagram defined as thick line made thicker to draw attention of the viewer or reader. Bars can be drawn horizontally or vertically. Height of bar diagram shows value of variable.
Types of bar charts:
(a) Simple bar chart: It includes (i) single bar chart and (ii) Multiple bar charts.
(i) Single bar chart: Represent only one variable.
(ii) Multiple bar charts: Represent more than one interrelated series data.
(B) Component/sub divided bar charts: Used when a breakdown of total or series of totals is to be represented.
Pie diagram:

It is a circle sub divided into components to present the proportion of different constituent parts of the total.

Known as Angular diagram. Used for presenting % break down of data.

Different components, proportions are also presented in terms of degree obtained by formula.
Degree for a component/group
Time series line graph:
It records the relationship between two variables. It presented in form of line graphs.
It also possible to show two or more comparable dependent variables.