Sector statistics chart uses the whole circle to represent the total (unit "1"), and uses the size of each sector in the circle to represent the percentage of each part in the total. The percentage sum of each part in the departmental statistical chart is
Unit "1". The relationship between the number of each part and the total number can be clearly expressed through the fan-shaped statistical chart. Different from the broken line statistical chart, it can't reflect the quantitative change trend; Unlike bar charts, it is not easy to see figures of various quantities.
The fan chart is also closely related to the percentage.
Special note: Sometimes "other" categories will appear in industry statistics. In general, by default, there are no items in the "Other" category that account for more than the clearly marked items.
Two steps
1. According to the given number of parts and the total number, find the percentage of each part in the total number.
2. Multiply 360 degrees by the corresponding percentage to get the degree of the central angle of the sector corresponding to each part in the sector statistical chart.
3. Draw a circle with a proper radius and draw a corresponding sector according to the degree of the central angle. (Note that the sector of each part must add up to a whole circle. )
3 function
Function: We can clearly understand the relationship and proportion between the quantity of each part and the total. (Proportion: Two expressions with equal proportions are called proportions. )
The relationship between fan-shaped area and its corresponding central angle is: fan-shaped area = degree of central angle ÷360× area of circle.
Four characteristics
Use the size of the fan to reflect the percentage of each part in the total.
The fan-shaped statistical chart can clearly understand the relationship between the number of each part and the total. Fan-shaped statistical chart can make some chaotic data clear and clear, make people see at a glance, help calculate all kinds of data, and become more convenient and fast!
How to do
A fan chart is a graph that shows the structure and proportion of things. So its manufacturing steps are as follows:
1. Write the title for statistical purposes.
2. Calculate the proportion of each group of values to the total.
3. Multiply the ratio of each group by 360 to get the sector angle of this group in the statistical chart.
4. Draw on the circular chart according to the angle of each sector.