Stata users produce graphs (often called figures) for their presentations and publications. Many such figures are composites with two or more separate panels, so that figure 1 is a composite of figure 1a, 1b, 1c, and 1d. There are two main ways to create such composites in Stata: using a by() option or using graph combine on previously created graphs. There are also commands such as graph matrix whose purpose is to create plots with multiple panels directly.

中文翻译：

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Stata Tip 139：图形的by（）选项可以比图形组合更好地工作

Stata用户为他们的演示文稿和出版物制作图形（通常称为图形）。许多这样的图是具有两个或更多单独面板的合成图，因此图1是图1a的组合，1b，1C和1d。在Stata中创建这种合成的主要方法有两种：使用by（）选项或在先前创建的图上使用图组合。还有一些命令，例如图形矩阵，其目的是直接创建具有多个面板的图。