In this video clip we'll learn how to
use
pie chart to visualize data of one categorical variable. By the name,
the pie chart is a circle broken up into
slides
that represent categories. The size or area of each slice of the pie
varies according to the percentage in each category.
So if we want to show percentage
of each category, it is ideal to use a pie chart.
In this example we use pie chart to represent
banking preference of different customers.
Let's create a pie chart for one variable
using Excel.
Here we have risk for mutual funds: average,
above average and below average.
Here we have unsummarized data,
if we have data already summarized in a summary table, we can directly
insert a pie chart here. Because of unsummarized data,
we can use a pivot chart here. 
We click pivot chart.
By default we use all the data. This is fine for us. We click ok.
Ok, here. Here we need to determine axis or categories. The category variable
here is risk. We drag risk to
this field, and then we need to drag a variable to value to summarize.
We can still use the same variable risk.
Here we can
right click the chart area and change series chart type
pie, pie, click ok, then we obtain
a pie chart. Even though here we have count, the pie chart shows us
percentage, because the size represents the exact
portion or percentage of each categorical level.
