a pie-chart is a circular chart divided
into slices or sectors
that correspond to the relative sizes of each value
because each pie sector generally groups multiple values from the underlying data model
the measure values are aggregated to produce a single representative value
this value determines the relative size of the sector
Pie charts are generally created from one measure and one dimension
for example, a pie chart can be used to visualize the breakdown of total sales by region
In this way you can quickly see the proportion of sales between the different regions
two styles of pie-chart views are
available
the traditional pie chart and the hollow-centered donut chart
Colors can be used to represent your data values in pie charts
for example, you can color the visualization by measure
to highlight the differences in sales results
Pie charts can use up to two measures to
display data
the first measure is used to determine
 the angle of each slice in the chart
a second measure can be added to determine the radius of each pie slice
for example we are going to add the average sales per invoice to sales
as a measure to the product group
this style of pie chart is also known as a
Rose chart
you cannot display negative value in a
pie chart
for example we are going to create a pie chart showing the sales for product subgroup
to calculate the radius we'll add a formula that compares the sales of the current year
to the sales of the previous year
since the result contains negative
values, you will have an error message
if you convert it into a donut chart
however the chart will be displayed
and the negative values will point in
towards the center of the pie chart
and that concludes this video thanks for
watching
