How do you read a pie chart? Research shows that people compare slices based on one of three measures: length of semi-arcs, angles and slice area: Now you understand the origins of a pie chart:Īs you can see, we first map the distances between data points, then stack them, connect them with a thick line (looks like a stacked bar chart), bend them and finally remove the hole to get the pie chart. If you haven’t read the page What is a chart I recommend you do it now. Categories must be seen as parts of a meaningful whole.Collectively exhaustive categories (all data points in the whole must be represented).Mutually exclusive, non-overlapping categories (a data point cannot belong to more than one slice).To make a pie chart your data should consist of: You are likely to see a lot of pies in a market research report also. In the corporate world, market share is the obvious example of data that can be represented with pie charts. The pie is a circular chart used to display proportions of a whole. Let them decide if they still love pie charts.Show them how abusing pie charts can be bad for business.
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