What is the Pie Chart or Pie Graph ?

The total of the percentages is equal to 100 (this is important; if it were not, the accuracy of the graph would be suspect).The total of the arc measures is equal to 360 degrees.

From this graph, one might gather that the professor for this course was not especially lenient nor severe.

It is evident that grading was not done on a "pure curve" (in which case all the arcs would have equal measures of 72 degrees, corresponding to 20%)

If this graph were compared with those of classes from other years that received the same test from the same professor, some conclusions might be drawn about intelligence changes among students over the years.

If this graph were compared with those of other classes in the same semester who had received the same final exam but who had taken the course from different professors, one might draw conclusions about the relative competence and/or grading whims of the professors.

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A Pie Chart (or Pie Graph) is a special chart that uses "pie slices" to show relative sizes of data.

The chart is divided into sectors, where each sector shows the relative size of each value.

Pie charts and bar charts are two of the most common charts used for visualizing data.

A bar chart, or bar graph, is a very common two-dimensional data visualization made up of rectangular bars, each corresponding to a category and whose length represents the value of that category.

The bars can be either vertical (sometimes called a column graph) or horizontal. For example, this figure shows a bar chart of the results of the 2000 US presidential election.

Each bar represents a candidate (the category) and the height of the bar represents how many votes that candidate received (the value).

A pie chart is also a very common two-dimensional data visualization where categories and their values are represented.

But in this case the values are proportions of a total and they are visualized as slices of a circle (a pie). Here are the same results on the 2000 US presidential election represented as a pie chart.

But in this case the values are proportions of a total and they are visualized as slices of a circle (a pie). Here are the same results on the 2000 US presidential election represented as a pie chart.

In the world of data visualizations, pie charts get a lot of hate. The primary goal of data visualizations is to clearly and concisely communicate information.

. The main criticism against pie charts is that it is very difficult for the human eye to estimate the magnitude of angles, thus making visualization not very clear.

To compensate, pie charts require more labels to get the measurements across, making them not very concise. In short, often they defeat the main purpose of a data visualization.

You can see this criticism with the previous example on the 2000 US presidential election, which was a famously close race.

The pie chart makes it rather difficult to tell who won the election without referencing the legend or adding data labels to each of the slices, whereas in the bar chart, it is immediately evident who won the popular vote.