A pie chart (or a circle graph) is a circular chart divided into sectors,
illustrating proportion. In a pie chart, the arc length
of each sector (and consequently its central
angle and area),
is proportional to the quantity it
represents. When angles are measured with 1 turn
as unit then a number of percent is identified with the same number of
centiturns. Together, the sectors create a full disk. It is named for its
resemblance to a pie
which has been sliced. The earliest known pie chart is generally credited to William
Playfair's Statistical Breviary of 1801.[1][2]
The pie chart is perhaps the most ubiquitous statistical chart in the business world and the mass media.[3] However, it has been criticized,[4] and some recommend avoiding it,[5][6][7][8] pointing out in particular that it is difficult to compare different sections of a given pie chart, or to compare data across different pie charts. Pie charts can be an effective way of displaying information in some cases, in particular if the intent is to compare the size of a slice with the whole pie, rather than comparing the slices among them.[1] Pie charts work particularly well when the slices represent 25 to 50% of the data,[9] but in general, other plots such as the bar chart or the dot plot, or non-graphical methods such as tables, may be more adapted for representing certain information.It also shows the frequency within certain groups of information.
The pie chart is perhaps the most ubiquitous statistical chart in the business world and the mass media.[3] However, it has been criticized,[4] and some recommend avoiding it,[5][6][7][8] pointing out in particular that it is difficult to compare different sections of a given pie chart, or to compare data across different pie charts. Pie charts can be an effective way of displaying information in some cases, in particular if the intent is to compare the size of a slice with the whole pie, rather than comparing the slices among them.[1] Pie charts work particularly well when the slices represent 25 to 50% of the data,[9] but in general, other plots such as the bar chart or the dot plot, or non-graphical methods such as tables, may be more adapted for representing certain information.It also shows the frequency within certain groups of information.
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