Below, I teach you how to use this external command to plot the triangular percentage of three variables in Stata. When doing data analysis, sometimes we need to divide the variables into equal parts, such as two equal parts according to the median, or four equal parts according to the quartile. Let's take a look at how to realize the quadratic division through stata. First, install the command astile. The csv format is the easiest to import into stata, big data can be downloaded into dbf format, and then use Stat/Transfer to import into dta format is the most convenient. Data import and export in the import before, you can first check out in stata.