How to create choropleth maps using the COVID-19 data from Johns Hopkins University

In my last post, we learned how to import the raw COVID-19 data from the Johns Hopkins GitHub repository and convert the raw data to time-series data. This post will demonstrate how to download raw data and create choropleth maps like figure 1.

Figure 1: Confirmed COVID-19 cases in United States adjusted for population size

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COVID-19 time-series data from Johns Hopkins University

In my last post, we learned how to import the raw COVID-19 data from the Johns Hopkins GitHub repository. This post will demonstrate how to convert the raw data to time-series data. We’ll also create some tables and graphs along the way. Read more…

Update to Import COVID-19 post

In my last post, I mentioned that I did not want to distribute my covid19.ado file because “it could be rendered useless if or when Johns Hopkins changes its data”. I wrote that on March 19, 2020, and the data changed on March 23, 2020. This will likely happen again (and again, and again …). I may post updates in the future as the data change, but you may need to adapt sooner than I can post. So let’s see how we can update our code to adapt to the changing data. Read more…

Import COVID-19 data from Johns Hopkins University

Like many of you, I am working from home and checking the latest news on COVID-19 frequently. I see a lot of numbers and graphs, so I looked around for the “official data”. One of the best data sources I have found is at the GitHub website for Johns Hopkins Whiting School of Engineering Center for Systems Science and Engineering. The data for each day are stored in a separate file, so I wrote a little Stata command called covid19 to download, combine, save, and graph these data. Read more…

Just released from Stata Press: Introduction to Time Series Using Stata, Revised Edition

Stata Press is pleased to announce the release of Introduction to Time Series Using Stata, Revised Edition, by Sean Becketti. This edition has been updated for Stata 16 and is available in paperback, eBook, and Kindle format. In this book, Becketti introduces time-series techniques—from simple to complex—and explains how to implement them using Stata. The many worked examples, concise explanations that focus on intuition, and useful tips based on the author’s experience make the book insightful for students, academic researchers, and practitioners in industry and government. Read more…

Bayesian inference using multiple Markov chains


Markov chain Monte Carlo (MCMC) is the principal tool for performing Bayesian inference. MCMC is a stochastic procedure that utilizes Markov chains simulated from the posterior distribution of model parameters to compute posterior summaries and make predictions. Given its stochastic nature and dependence on initial values, verifying Markov chain convergence can be difficult—visual inspection of the trace and autocorrelation plots are often used. A more formal method for checking convergence relies on simulating and comparing results from multiple Markov chains; see, for example, Gelman and Rubin (1992) and Gelman et al. (2013). Using multiple chains, rather than a single chain, makes diagnosing convergence easier.

As of Stata 16, bayesmh and its bayes prefix commands support a new option, nchains(), for simulating multiple Markov chains. There is also a new convergence diagnostic command, bayesstats grubin. All Bayesian postestimation commands now support multiple chains. In this blog post, I show you how to check MCMC convergence and improve your Bayesian inference using multiple chains through a series of examples. I also show you how to speed up your sampling by running multiple Markov chains in parallel. Read more…

Adding recession shading to time-series graphs


Sometimes, I like to augment a time-series graph with shading that indicates periods of recession. In this post, I will show you a simple way to add recession shading to graphs using data provided by import fred. This post also demostrates how to build a complex graph in Stata, beginning with the basic pieces and finishing with a polished product.

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Categories: Graphics Tags: ,

Stata Certified Gift Guide 2019

The holidays are fast approaching, and if you’re like most people, you’re still not exactly sure what gift or gifts to get those special people in your life. Enter the Stata Certified Gift Guide. We polled our team and compiled their favorites into the ultimate gift guide for data lovers! Sure, you could go the typical gift card route, but where’s the fun in that?

Power Nap Pillow
Sometimes, you just need to close the door and take a power nap.

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Stata in the Cloud

As more organizations move their IT, data management, and data analysis needs to the Cloud, I often have to answer these questions:

  1. Can Stata run in the Cloud?
  2. Am I allowed to run my copy of Stata in the Cloud?
  3. What is the best setup for Stata in the Cloud?
  4. How does Stata perform in the Cloud?

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Using the lasso for inference in high-dimensional models

Why use lasso to do inference about coefficients in high-dimensional models?

High-dimensional models, which have too many potential covariates for the sample size at hand, are increasingly common in applied research. The lasso, discussed in the previous post, can be used to estimate the coefficients of interest in a high-dimensional model. This post discusses commands in Stata 16 that estimate the coefficients of interest in a high-dimensional model. Read more…