Mata is Stata's matrix programming language. StataCorp provides detailed documentation on it, but so far has failed to give users-and especially users who add new features to Stata-any guidance in when and how to use the language. This talk provides what has been missing. In practical ways, this...

Although survey data are sometimes weighted by their selection weights, it is often preferable to use auxiliary information available on the whole population to improve estimation. Calibration weighting (Deville and Sarndal, 1992, Journal of the American Statistical Association 87: 376-382) is...

In this presentation, I update Nichols and Schaffer's 2007 UK Stata Users Group talk on clustered standard errors. Although cluster-robust standard errors are now recognized as essential in a panel-data context, official Stata only supports clusters that are nested within panels. This...