\(\newcommand{\epsilonb}{\boldsymbol{\epsilon}}

\newcommand{\ebi}{\boldsymbol{\epsilon}_i}

\newcommand{\Sigmab}{\boldsymbol{\Sigma}}

\newcommand{\betab}{\boldsymbol{\beta}}

\newcommand{\eb}{{\bf e}}

\newcommand{\xb}{{\bf x}}

\newcommand{\zb}{{\bf z}}

\newcommand{\yb}{{\bf y}}

\newcommand{\Xb}{{\bf X}}

\newcommand{\Mb}{{\bf M}}

\newcommand{\Eb}{{\bf E}}

\newcommand{\Xtb}{\tilde{\bf X}}

\newcommand{\Vb}{{\bf V}}\)I present the formulas for computing the ordinary least-squares (**OLS**) estimator, and I discuss some do-file implementations of them. I discuss the formulas and the computation of independence-based standard errors, robust standard errors, and cluster-robust standard errors. I introduce the Stata matrix commands and matrix functions that I use in ado-commands that I discuss in upcoming posts.

This is the fifth post in the series **Programming an estimation command in Stata**. I recommend that you start at the beginning. See Programming an estimation command in Stata: A map to posted entries for a map to all the posts in this series. Read more…

I discuss the code for a simple estimation command to focus on the details of how to implement an estimation command. The command that I discuss estimates the mean by the sample average. I begin by reviewing the formulas and a do-file that implements them. I subsequently introduce ado-file programming and discuss two versions of the command. Along the way, I illustrate some of the postestimation features that work after the command.

This is the fourth post in the series **Programming an estimation command in Stata**. I recommend that you start at the beginning. See Programming an estimation command in Stata: A map to posted entries for a map to all the posts in this series. Read more…

If you tell me “I program in Stata”, it makes me happy, but I do not know what you mean. Do you write scripts to make your research reproducible, or do you write Stata commands that anyone can use and reuse? In the series #StataProgramming, I will show you how to write your own commands, but I start at the beginning. Discussing the difference between scripts and commands here introduces some essential programming concepts and constructions that I use to write scripts and commands.

This is the second post in the series **Programming an estimation command in Stata**. I recommend that you start at the beginning. See Programming an estimation command in Stata: A map to posted entries for a map to all the posts in this series. Read more…