Posted in Data Science, Stata, Statistics and tagged do file, extended functions, list, local, loops, macro, programming, Stata on Januby Paz, Lourenco S. You can find more about these macro extended functions on Stata by typing “help extended_fcn”. And the “word `j’ of `fruits’” returns the j-th element of the macro fruits. So, the “word count” function returns the number of elements of the macro. * The second step is to build a loop to pair each fruit with its PLU code */ * The first step is to find out the number of fruits */ * The third step is to pick the j-th element of each list to have them paired */ Now suppose we have an ordered list of produce 4-digit codes and we would like to display the PLU code next to each fruit name. Just for fun, see what happens when you replace “local counter= `counter’+1” by “local counter `counter’+1”.

Notice that I used the equal sign “=” to build the counter. You can place it on the do-file editor and then run it.Īfter running it, the output should be something like this: The first example is about using a counter. By the way, it is always good to keep in mind that a good programming practice is to always keep definitions local to the do-file you are coding whenever possible. Although these tools may not be the most computationally efficient technique, they can be of great help during the early stages of code development. Loops and lists are important tools for Stata programmers. An Introduction to Statistical Learning with Applications in Python Posted in Data Science, Stata, Statistics and tagged coding, do file, local macro, macros, programming, Stata on Decemby Paz, Lourenco S. I guess you have a pretty good idea of how this works now.

Let’s add another layer to the nesting of the previous example and play with it a little bit more: Local nestmacro “Local macros can be nested!” That is, it first replaces the innermost local macro, then the second innermost local macro, and so on. Now, Stata applies the “parentheses rule” when replacing local macros for their contents.

You need to use the equal sign to make Stata to evaluate the expression, otherwise it will treat it like a string. Also, note how macro3 and macro4 lead to different outcomes. Make sure to leave no spaces inside the `’. macro1′ tells Stata to replace this expression with the contents of the local macro1. Here is a simple example.ĭi “Here’s some math: `macro3' = `macro4′ ”Ī few comments are in order here. Local macros are a very useful feature of Stata.

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