Tobacco smoking and obesity greatly contribute to premature death and disease in developed countries. In order to measure the extent to which these risk factors affect a population, as well as to describe the progression of these epidemics over time, routine surveillance of the prevalence of...

Many economic time series exhibit important systematic fluctuations within the year, i.e., seasonality. Differently from usual practice, we argue that using original data should always be considered, although an unadjusted data process is more complicated than that of seasonally adjusted data....

This paper provides a set of new Stata commands for parametric and semiparametric estimation of an extended version of ordered response models that accounts for both sample selection problems and heterogeneity in the thresholds for the latent variable. The standard estimator of ordered response...

In this paper, I present a Stata program (sensatt) that implements the sensitivity analysis for matching estimators proposed by Ichino, Mealli, and Nannicini (2008). The analysis simulates a potential confounder to assess the robustness of the estimated treatment effects with respect to...

In several medical reports, the survival function is graphed along with the confidence intervals. The endpoints of the confidence intervals are usually connected to draw an area where the entire survival curve is contained with a given confidence. Confidence intervals are pointwise, i.e., they...

Reproducible research is one of many names for the same concept: writing a single report document that contains both the report and the commands needed to produce the results and graphics contained in the report. It is called reproducible research because any interested researcher can then...

I derive new estimators and tests of correlated effects for the (possibly) unbalanced multiway error component model (ECM), extending existing results in various aspects. The results by Kang (1985) on specification tests, who extended Hausman and Taylor (1981) and Mundlak (1978) to the two-way...

Stata is a software package that is currently widely used, and its utility is being recognized. This is leading to its increasing use worldwide in major departments of epidemiology and biostatistics, for both research and teaching purposes. The ability to use it at various levels of...