Bar chart

Ala’a, Abrar, Ghadeer
Sahab, Shahad, Nada

 Definition
 Types of bar chart
 Bar Charts uses
 Bar chart statistics
 Difference of bar and histogram charts
 Advantages & disadvantages

 A bar graph is a chart that uses either
horizontal or vertical bars to show
comparisons among categories.

shows the specific
categories being
compared
represents a
discrete value.
Axis
Axis

Single
(vertical)
Grouped
Stacked
Horizontal

 Single bar graphs are used to convey the
discrete value of the item for each category
shown on the opposing axis.

 it is also possible to draw bar charts so that
the bars are horizontal which means that the
longer the bar, the larger the category.

 A grouped or clustered bar graph is used to
represent discrete values for more than one
item that share the same category.

 Grouped bar charts are a way of showing
information about different sub-groups of the
main categories.
 but care needs to be taken to ensure that the
chart does not contain too much information
making it complicated to read and interpret.

 Some bar graphs have the bar divided into
subparts that represent the discrete value for
items that represent a portion of a whole
group.

 Stacked bar chars are similar to grouped bar
charts in that they are used to display
information about the sub-groups that make
up the different categories.
 Stacked bar charts can also be used to show
the percentage contribution different sub-
groups contribute to each separate category.

Bar Charts uses
 useful for comparing classes or groups of data.
In bar charts, a class or group can have a
single category of data, or they can be broken
down further into multiple categories for
greater depth of analysis.

• Examine your data to find the bar with
the largest value. This will help you
determine the range of the vertical axis
and the size of each increment.
Determine
the
discrete
range
• Examine your data to find how many bars
your chart will contain. Use this number to
draw and label the horizontal axis.
Determine
the
number of
bars

• Bars may be arranged in any order. (A
bar chart arranged from highest to
lowest incidence is called a Pareto
chart).
Determine
the order
of the bars
• If you are preparing a grouped bar
graph, remember to present the
information in the same order in each
grouping
Draw the
bars

Bar chart
statistics
Mean
the average height of all the
bars.
Maximum
the maximum value (tallest
bar) in the series.
Minimum
the minimum value (shortest
bar) in the series.
Sample Size
the number of values (bars) in
the series.
Range
the maximum value minus the
minimum value.
Standard
Deviation
Indicates how widely data is
spread around the mean.

the tallest bar.
the shortest bar.
growth or shrinking of the bars
one bar relative to another.
change in bars representing the same
category in different classes

Other tips
 Watch out for inconsistent scales. If you're
comparing two or more charts, be sure they
use the same scale. If they don't have the
same scale, be aware of the differences and
how they might trick your eye.
 Be sure that all your classes are equal. For
example, don't mix weeks and months, years
and half-years.

 Be sure that the interval between classes is
consistent. For example, if you want to
compare current data that goes month by
month to older data that is only available for
every six months, either use current data for
every six months or show the older data with
blanks for the missing months.
Other tips

Bar graph
type of data
 In bar graphs are usually
used to display "categorical
data", that is data that fits
into categories
Histogram graph
type of data
 used to present "continuous
data", that is data that
represents measured
quantity where, at least in
theory, the numbers can
take on any value in a
certain range

the way they are drawn
 the bars in bar graphs are
usually separated
the way they are drawn
 the bars are adjacent to
each other
Bar graph Histogram graph

Advantages
1. show each data category in a frequency
distribution
2. display relative numbers or proportions
3. summarize a large data set in visual form
4. clarify trends better than do tables
5. estimate key values at a glance
6. permit a visual check of the accuracy
7. be easily understood

1. require additional explanation
2. be easily manipulated to yield false
impressions
3. fail to reveal key assumptions, causes,
effects, or patterns
Disadvantages

 http://en.wikipedia.org/wiki/Bar_chart
 http://custom-
analytics.thomsonreuterslifesciences.com/Spo
tfireWeb/Help/dxpwebclient/bar_what_is_a_
bar_chart.htm
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er%20Skills%20Leicester/page_47.htm
 http://mathcentral.uregina.ca/QQ/database/
QQ.09.99/raeluck1.html

Bar chart

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