A Histogram is a graphical display of data using bars of different heights.
It is similar to a Bar Chart, but a histogram groups numbers into ranges
And you decide what ranges to use!
Example: Dress Shop Survey
You asked customers who bought one of the "Aurora" range of skirts how old they were.
The ages were from 5 to 25 years old.
You decide to put the results into groups of 5:
- The 1 to 5 years old range,
- The 6 to 10 years old range,
So when someone says "I am 17"
And here is the result:
You can see (for example) that there were 30 customers between 6 and 10 years old
Histograms are a great way to show results of continuous data, such as:
- how much time
But if your data is in categories (such as Country or Favorite Movie), then you should use a Bar Chart.
A Frequency Histogram is a special histogram that uses vertical columns to show frequencies (how many times each score occurs):
|Here I have added up how often 1 occurs (2 times), how often 2 occurs (5 times), etc, and shown them as a histogram.|