Does becoming President of the United States cause you to age faster than you would have otherwise, if you had not become President? Media sources have claimed that presidents age more quickly while in office. The British tabloid The Daily Mail asserted “American presidents age TWICE as fast while in office” (Daily …

An annoyance (for me) is when I want to compare different groups portrayed in a nice plot that is kind enough to provide error bars. Consider a hypothetical data collection effort where we have 5 groups and are looking at the mean outcome of these 5 groups. Our estimated means and standard deviations are as follows: …

Once an analysis is in, we need to think carefully about how to talk about our results. Statistics is about inference, about capturing the uncertainty in our findings given limitations of our data and estimation error. We want the reader to quickly assess how seriously to take an estimated difference, and we want to …

This is a live document that is subject to updating at any time. Introduction This document, the first of a three part series, is an introduction to matching in R using the optmatch and RItools packages. We focus on unit-to-unit matching, as opposed to other recent approaches that focus on obtaining overall balance in …