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In this video we will basically introduce
you to pie chart and teach you to make one.
Basically we describe the data graphically
in four ways . They are :
Bar graph
Pie Chart or Pie Graph
line Diagram
Box Plot
In this video we are going to deal with the
Pie Chart or Pie Graph.
So lets start.
It is used for diagrammatical representation
of data consisting the combination
of categorical and numerical variable only.and
It is a circular representation of data as
a whole.
#So lets draw a circle and this circle represents
the whole data#
where the categorical data (eg: A,B,C) are
represented as slice of circle.
#So lets cut the circle in three slices and
represent the data (A,B,C) inside the slice
.#
where ,the slice is divided as per the numerical
proportion of the variable
with respect to whole data.
#The size of the slice is adjusted as per
the relative size of the data with respect
to whole data . or
we can say the size of the slice depends on
its proportion it constributes to the whole
data.
##
##
For example Suppose A is 20% ,B is 35% and
C is 45% then The Slice where C lies is largest
< After that b has larger slice and a has
the smallest slice
##
Let us understand this with an example:
lets refer to this data where the first column
consists of sports name and second colum consists
of number of
vote .Here sports is the categorical variable
and vote is the numerical
variable and since we can draw a pie chart
only between categorical variable and numerical
variable.
Thus we can construct pie chart or pie graph
for this data .
so first we have convert the data into their
respective percentage .
So, lets construct another table with a row
consisting of respective percentage or proportion.
where the percentage proportion is equal to
value divided by total value multiplied by
100
here our value is represented by vote and
the total value is calculated by adding all
the vote which results into 145 votes
and then we calculate the results in percentage
using the above formula which result as 14%
for football, 31 percent
for basketball and 55% for volleyball And
the total of these percentages must be 100
And in next step we need to convert this percenatge
data into degree:
so let us understand how can we convert the
percentage data into degree.
The main idea is the whole circle represents
the whole data and when we refer to whole
data it refers to 100% of the data
Thus we can formulate whole circle as 100
%(#correct) and as a complete circle has 360
degree
We conclude that that 100% is equivalent to
360 degree
i.e 1% is equivalent to 3.6 degree
And using this statementwe calculate that
14% is equivalent to 50 degree
similarly 31 % is equivalent to 112 degree
and 55% is equivalent to 198 degree.
and when we add all these angles it must total
to give 360 degree
So lets fill these value in the table.
And finally we can draw our pie chart.
So to draw the pie chart , we start with a
circle . Now bring a protractor and slice
the circle with angle 50 degree
on its center which represents the football
. Similarly next to football slice make another
slice with angle 112 degree
for basketball and the remaining slice must
be 198 degree which represents the volleyball.
Then provide the percentage to the respective
slices and
Now we provide a cross pattern to the volleyball
slice , plus pattern to the basketball slice
and equal to sign pattern to the football
and give
index to footbll , basketball and volleyball
using the pattern we have used . and we can
use any pattern but same pattern cannot be
used twice.
And hence our pie chart is complete.
So we have done our best to explain about
bar pie.
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