Blog Content

Instrumental Variables: Friend or Foe?

causal inference
statistics
data science
science of science
econometrics
instrumental variables
health policy
I’ve been trying to read more carefully about instrumental variables (IV) and make up my mind about when IV analyses are scientifically convincing.
May 6, 2025
Christian Testa

Screenshot of lecture notes first page

Brief History of Probability Notes

notes
probability
statistics
Tuesday September 3rd, the first day of our semester, I needed to cover teaching for our professor teaching BST/BIOSTATS 230 Probability I, so as part of that I got to…
Sep 3, 2024
Christian Testa

Bhramar Mukherjee’s Marvin Zelen Award Talk

talks
statistics
This last Thursday (May 9th, 2024), Bhramar Mukherjee received the annual Marvin Zelen Award from the Harvard Biostatistics Department.
May 12, 2024
Christian Testa

Our Trip to Seattle

photography
travel
Seattle was so much fun! I don’t know how on Earth we did so much in just two days, but we did.
Jul 10, 2023
Christian Testa

Scale (Zoom) Dependent Maps with Leaflet in R

geography
mapping
R
programming
data-science
Something I’ve wanted to accomplish for a while is producing interactive maps in R that provide a higher level of resolution as the user zooms in.
Jun 10, 2023
Christian Testa

The first offering of ID529 Data Management and Analytic Workflows in R at Harvard

teaching
Teaching ID529 was such a blast, and I’m so happy with how the course turned out. The students have repeatedly communicated that they learned an extraordinary amount, that…
Feb 13, 2023
Christian Testa

Relationship of political ideology of US federal and state elected officials and key COVID pandemic outcomes

publications
Now that our paper is out in the Lancet Regional Health Americas, I wanted to write up a blog post talking about it.
Nov 1, 2022
Christian Testa

The Public Health Disparities Geocoding Project 2.0

research
teaching
The Public Health Disparities Geocoding Project 2.0 was a workshop where my colleagues and I trained 150 Public Health professionals from diverse backgrounds (city and state…
Oct 1, 2022
Christian Testa

My wife Jane and I strolling along at our wedding. The backdrop is a trail with lovely green foliage and grass.

2021 in Review

yearly-review
photography
publications
I couldn’t really talk about 2021 without mentioning that I got married in June 2021!
Dec 26, 2021

Boston Night Skyline

photography
I just wanted to share this really nice photo I took of the Boston skyline in the last couple weeks.
Jun 1, 2021
Christian Testa

Simulation, Error, and Modeling the Physical World

simulation
modeling
physics
A few years ago I took a course from Sauro Succi called Computational Methods for the Physical Sciences that surveyed topics such as computational methods for solving…
Mar 20, 2021
Christian Testa

Intro to Gaussian Processes

machine-learning
statistics
In this article I’m going to try to provide some intuition around how multivariate Gaussian distributions and Gaussian process models can be useful for modeling smooth…
Jan 16, 2021
Christian Testa

National Zoo, 2018

photography
travel
These are just a handful of the shots I thought turned out best from a trip I took down to Washington DC in 2018. Besides visiting the National Zoo, I danced at the DC…
Nov 23, 2018
Christian Testa

HOPE 2020

technology
conferences
HOPE 2020 took place July 25th through August 2nd and for the first time ever was all-online due to the COVID-19 pandemic. I’ve written up this summary of my seven favorite…
Nov 23, 2018
Christian Testa

 

Resources for R Programmers

R
programming
This is a set of resources for people interested in the R programming language.
May 24, 2018
Christian Testa

Introduction to the Theory of Elliptic Curves

mathematics
Elliptic curves are a subject, simple to construct and ubiquitous, that have found themselves at the forefront of Number Theory and Algebraic Geometry research. The subject…
Mar 18, 2017
Christian Testa

QualtricsTools : Automated Survey Processing

surveys
R
shiny
QualtricsTools is an open source application built in R Shiny that I started while working at Tufts that allows users to upload a Qualtrics JSON QSF Survey File, and…
Mar 17, 2017
Christian Testa

Washington State Photography

photography
travel
I took some photos in Olympic National Park and around Seattle
Aug 31, 2016
Christian Testa

Colorado State Photography

photography
travel
I took some photos in Rocky Mountain National Park and around Denver
Aug 31, 2016
Christian Testa
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