饼图的视觉效果蛮好的, 可是国外很多学者都呼吁我们在科研论文中别再用饼图了。这是为什么呢?

请看以下几篇文献报道:

1. PIE CHARTS ARE BAD

2. Death to pie charts

3. Why You Should Avoid Pie Charts.

However, some said piecharts deserve our resepct although it has obvious defects in some cases. Here are two of them.

1.Why Tufte is Flat-Out Wrong about Pie Charts

2. Problems with pie charts 

作者的结 论： In sum, I think they (piecharts ) are just good for grossly depicting the distribution of 2 to 3 classes (I use them, from time to time, to show the distribution of males and females in a sample on top of an histogram of ages), but they must be accompanied by relative frequencies or counts for being really informative. A table would still do a better job since you can add margins, and go beyond 2-way classifications.)

就是说,只是两三个类型进行对比，采用饼图的效果还是很好的，数据很多的情况下最好采用表格， 数据不是特别多但是不只三四个，最好采用柱状图，如果想看变化趋势，用点状图效果更好！