中心条形图(Centred Bar Plot) Centred bar plots are used to show the frequency (absolute or relative) of the y-variable as centred horizontal bars. These are commonly used in archaeology and may also be known as battleship curves or battleship diagrams.

英国杜伦大学（Durham University）的Nicholas J. Cox开发了一款Stata社区命令cbarplot，用来绘制中心条形图。

安装Stata社区命令cbarplot的Stata命令如下：

ssc install cbarplot, replace

演示命令如下：

sysuse auto, clear
cbarplot rep78 , by(foreign)  percent(rep78)  ysc(reverse)
cbarplot rep78 foreign,  percent(rep78)  ysc(reverse)

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