Final answer:
The option to split a pie data series into a secondary chart is known as exploding a pie chart or creating a pie of pie chart. This allows for better focus on larger segments while still showing smaller segments that fall below a set percentage cutoff in a more visible and understandable manner.
Step-by-step explanation:
The option of splitting a pie data series into a second, smaller pie chart that allows you to select a cutoff point by percentage, rather than value, and assign all the percentages below that point to the second plot is known as exploding a pie chart or creating a pie of pie chart. In a pie graph, each slice represents a share of the total, which is a percentage. With this option, you can effectively focus on the larger segments in the main pie chart, while still representing the smaller segments in the secondary pie chart. This technique can make the presentation of data clearer and highlight the most significant parts of the data.
For example, in a pie chart representing government spending, if you want to focus on the largest categories while still depicting the small ones, you might create a secondary pie chart to show any segment that comprises less than 5% of the total spending. This secondary chart would thus contain all the minor spending categories that are under this percentage threshold, making them more visible and allowing for a better understanding of how they cumulatively contribute to the total budget.