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Bar Graph
What is it?
A bar graph is used to graphically present data that you have gathered. The type of data represented in a bar graph is the number of occurrences measured in different categories of data. A bar graph is often used to graphically represent the information you have gathered in a table. For example, in the bar graph below, you can see a comparison of the number of users of different services--outpatient, inpatient, and other--by type of service.
Who uses it?
The team and the managers.
Why use it?
It helps you visualize relationships among different categories of factors
affecting services to the users.
When to use it?
It is used when the information corresponds to a nominal scale (a
counting of occurrences), and when you want to compare two or
more groups (no more than six).
How to use it:
- Draw vertical and horizontal axes.
- On the vertical axis, create a scale to measure the frequencies of the variable (for example, number of users or number of times).
- On the horizontal axis, note the nominal scale (different qualities of the variable), for example, male/female, inpatient/outpatient, types
of contraceptives, etc. It doesn't matter in what sequence the data categories are listed.
- Draw a rectangle for each quality of the variable. The height
represents the frequency with which that characteristic was observed. For example, in the bar graph below there are 30 outpatient users, 40 inpatient users, and 50 other users.
Example:
Here is an example of a bar graph being used to describe a
problem.
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