| 单词 | pie diagram |
| 释义 | pie diagram A diagram used to display the relative size of variables. For example, the shares of a country's exports going to various regions of the world can be shown by the size of their slices of a circular pie. Pie diagrams can also be used to compare totals, for example a country's total exports at different dates. A circle with a radius λ times that of another has an area λ2 times as great: pie diagrams with radii of 1 and √2 can be used to show, for example, that exports doubled between 1980 and 1990. Panel 1: Shares in period 1 are shown by the relative sizes of slices A, B and C. These could be shares in anything, for example output in three sectors of the economy. Panel 2: Shares in period 2 are shown in the same way. The size of the diagram is unchanged, so only changes in shares can be shown. Panel 3: Shows both changes in shares, found by comparing the angle of each slice at the centre of the circle with Panel 1, and changes in total quantities, shown by the size of the pie. Multiplying the radius by λ multiplies the area by λ2, so if the radius of the Panel 3 pie is twice that of Panels 1 or 2, it shows that the total quantities concerned were 4 times as large. |
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