Thomas S. Dee
@tomdee.bsky.social
Barnett Family Professor, Stanford University 🌲
Senior Fellow, @hooverinstitution.bsky.social & @siepr.bsky.social
Research Associate, @nber.org
https://dee.stanford.edu/
#GoBirds 🦅
Senior Fellow, @hooverinstitution.bsky.social & @siepr.bsky.social
Research Associate, @nber.org
https://dee.stanford.edu/
#GoBirds 🦅
Pinned
Thomas S. Dee
@tomdee.bsky.social
· Nov 21
At today's #2024APPAM Rossi Award Lecture, I’ll argue the substantial impact of open-science practices has been far too narrow.
It’s time to adapt & adopt open-science practices—especially
preregistration—for quasi-experimental designs (QEDs).
#EconSky #EduSky #APPAM2024 @appam.bsky.social
🧵…
It’s time to adapt & adopt open-science practices—especially
preregistration—for quasi-experimental designs (QEDs).
#EconSky #EduSky #APPAM2024 @appam.bsky.social
🧵…
Reposted by Thomas S. Dee
For context, this drop in attendance rates related to the measles outbreak (about 93% to 90%) is almost as large as the initial drop in TX attendance rates from pre-pandemic to post-pandemic (95% in 2018-19 to 91% in 2021-22).
(TX attendance trends over time here: www.aei.org/research-pro...)
(TX attendance trends over time here: www.aei.org/research-pro...)
We provide early evidence on the impact of vaccine-preventable disease outbreaks on learning opportunities, and the schooling disruptions that the growing number of low-coverage communities could face if outbreaks continue to spread. See working paper: edworkingpapers.com/ai25-1358
The West Texas Measles Outbreak and Student Absences
Declining child-vaccination rates are driving a measles resurgence in the US, yet little evidence documents how these outbreaks may disrupt schooling. Using daily absence data from a school district a...
edworkingpapers.com
December 17, 2025 at 6:04 PM
For context, this drop in attendance rates related to the measles outbreak (about 93% to 90%) is almost as large as the initial drop in TX attendance rates from pre-pandemic to post-pandemic (95% in 2018-19 to 91% in 2021-22).
(TX attendance trends over time here: www.aei.org/research-pro...)
(TX attendance trends over time here: www.aei.org/research-pro...)
Reposted by Thomas S. Dee
In 2000, measles was declared eradicated in the U.S. Today, declining child-vaccination rates are driving the largest measles resurgence we've seen in 3+ decades. How do these outbreaks impact schooling? @tomdee.bsky.social and I examine this question in West Texas, the country's largest outbreak.
December 17, 2025 at 3:59 PM
In 2000, measles was declared eradicated in the U.S. Today, declining child-vaccination rates are driving the largest measles resurgence we've seen in 3+ decades. How do these outbreaks impact schooling? @tomdee.bsky.social and I examine this question in West Texas, the country's largest outbreak.
Our preregistered study of mental-health co-responders—now out in Nature Human Behaviour (doi.org/10.1038/s415...) —finds positive benefits in terms of significant reductions in psychiatric detentions and future mental-health crises relative to police-only responses.
November 17, 2025 at 4:06 PM
Our preregistered study of mental-health co-responders—now out in Nature Human Behaviour (doi.org/10.1038/s415...) —finds positive benefits in terms of significant reductions in psychiatric detentions and future mental-health crises relative to police-only responses.
Thanks. FYI, my study came out last week in @pnas.org and is open access: doi.org/10.1073/pnas...
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
doi.org
November 14, 2025 at 7:41 PM
Thanks. FYI, my study came out last week in @pnas.org and is open access: doi.org/10.1073/pnas...
Open access is available here: doi.org/10.1073/pnas....
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
doi.org
November 4, 2025 at 6:24 PM
Open access is available here: doi.org/10.1073/pnas....
The aggressive immigration raids we now see across the nation began 10 months ago in California's Central Valley. Their impact on children, families, and communities is an important & active area of research
I'm pleased my study of the initial raid's early impact on students is now out in @pnas.org
I'm pleased my study of the initial raid's early impact on students is now out in @pnas.org
November 4, 2025 at 6:24 PM
The aggressive immigration raids we now see across the nation began 10 months ago in California's Central Valley. Their impact on children, families, and communities is an important & active area of research
I'm pleased my study of the initial raid's early impact on students is now out in @pnas.org
I'm pleased my study of the initial raid's early impact on students is now out in @pnas.org
👍 but I think it's far less difficult (and constraining of discovery) than some people think. For example, it's simple enough to preregister a "decision tree" of research designs to be informed by robustness checks.
The key thing is to create transparency to support sense-making of study results
The key thing is to create transparency to support sense-making of study results
October 27, 2025 at 9:11 PM
👍 but I think it's far less difficult (and constraining of discovery) than some people think. For example, it's simple enough to preregister a "decision tree" of research designs to be informed by robustness checks.
The key thing is to create transparency to support sense-making of study results
The key thing is to create transparency to support sense-making of study results
Empirical evidence and conceptual reasoning suggest quasi-experimental studies—the most common form of studies making causal claims—have a "p-hacking" problem.
My essay on this and the case for adapting & adopting QED preregistration is now published in Evaluation Review.
doi.org/10.1177/0193...
My essay on this and the case for adapting & adopting QED preregistration is now published in Evaluation Review.
doi.org/10.1177/0193...
Sage Journals: Discover world-class research
Subscription and open access journals from Sage, the world's leading independent academic publisher.
doi.org
October 27, 2025 at 3:33 PM
Empirical evidence and conceptual reasoning suggest quasi-experimental studies—the most common form of studies making causal claims—have a "p-hacking" problem.
My essay on this and the case for adapting & adopting QED preregistration is now published in Evaluation Review.
doi.org/10.1177/0193...
My essay on this and the case for adapting & adopting QED preregistration is now published in Evaluation Review.
doi.org/10.1177/0193...
Such a warm, engaging, and informative visit! My thanks to the @annenberginstitute.bsky.social at Brown University for inviting me to give the Annenberg 2025 Distinguished Lecture.
October 24, 2025 at 4:52 PM
Such a warm, engaging, and informative visit! My thanks to the @annenberginstitute.bsky.social at Brown University for inviting me to give the Annenberg 2025 Distinguished Lecture.
Not sure but always happy to connect! I plan to stress some of the aligned ideas in this recent @edweek.org #K12BigIdeas essay👇 and your recent book! (www.amazon.com/rethinking-c...).
www.edweek.org/leadership/o...
www.edweek.org/leadership/o...
High Quality Research Rarely Informs Classroom Practice. Why? (Opinion)
The connection between education research, policy, and practice is broken. Here’s what it would take to fix it.
www.edweek.org
October 16, 2025 at 3:52 PM
Not sure but always happy to connect! I plan to stress some of the aligned ideas in this recent @edweek.org #K12BigIdeas essay👇 and your recent book! (www.amazon.com/rethinking-c...).
www.edweek.org/leadership/o...
www.edweek.org/leadership/o...
I'm honored to give the Annenberg 2025 Distinguished Lecture next week and looking forward to being in conversation with this outstanding community.
Join us for the Annenberg 2025 Lecture with @tomdee.bsky.social, Barnett Family Professor at Stanford University, on understanding and addressing chronic absenteeism.
🗓️ October 22, 4:00 PM EDT 📍 MacMillan Hall, Room 117, Brown University.
Register: buff.ly/U8JtaAO
🗓️ October 22, 4:00 PM EDT 📍 MacMillan Hall, Room 117, Brown University.
Register: buff.ly/U8JtaAO
October 16, 2025 at 3:22 PM
I'm honored to give the Annenberg 2025 Distinguished Lecture next week and looking forward to being in conversation with this outstanding community.
Know any aspiring PhD students interested in quant studies in education? Please direct them to our programs in ed policy, econ of ed, or ed data science! I hope to welcome an energetic & ambitious student to join me in our new building 🌴☀️
Applications due November 17
ed.stanford.edu/admissions/a...
Applications due November 17
ed.stanford.edu/admissions/a...
Apply for Admission | Stanford Graduate School of Education
As you prepare your application, familiarize yourself with the admission process and timeline for your desired program below. Note that the application for 2026-2027 entry is not yet available.
ed.stanford.edu
October 6, 2025 at 6:03 PM
Know any aspiring PhD students interested in quant studies in education? Please direct them to our programs in ed policy, econ of ed, or ed data science! I hope to welcome an energetic & ambitious student to join me in our new building 🌴☀️
Applications due November 17
ed.stanford.edu/admissions/a...
Applications due November 17
ed.stanford.edu/admissions/a...
🚨Do you know a school, system, or network doing amazing work in support of student success in high school, particularly through a continuous-improvement approach?
Let's recognize them! Encourage them to apply for the Carnegie Award for Impact (cfdn.at/4o4gp58).
Applications due on November 10.
Let's recognize them! Encourage them to apply for the Carnegie Award for Impact (cfdn.at/4o4gp58).
Applications due on November 10.
October 3, 2025 at 6:29 PM
🚨Do you know a school, system, or network doing amazing work in support of student success in high school, particularly through a continuous-improvement approach?
Let's recognize them! Encourage them to apply for the Carnegie Award for Impact (cfdn.at/4o4gp58).
Applications due on November 10.
Let's recognize them! Encourage them to apply for the Carnegie Award for Impact (cfdn.at/4o4gp58).
Applications due on November 10.
Reposted by Thomas S. Dee
I have watched states delay releasing test scores for months as they work to message results and hope no one is paying attention.
JUST IN: Bureau of Labor Statistics postpones key inflation data report
Bureau of Labor Statistics postpones key data report with no explanation
There is heightened concern about the future of key government statistics, including politicization and accuracy.
trib.al
September 20, 2025 at 12:07 PM
I have watched states delay releasing test scores for months as they work to message results and hope no one is paying attention.
It's gratifying to see my recent immigration-raid research actually being used.
wapo.st/42mWdTn
wapo.st/42mWdTn
Teachers sue over Trump's immigration crackdown, saying students are staying home
Labor unions representing educators and school employees are suing President Donald Trump’s administration over its immigration crackdown
wapo.st
September 12, 2025 at 10:10 PM
It's gratifying to see my recent immigration-raid research actually being used.
wapo.st/42mWdTn
wapo.st/42mWdTn
Reposted by Thomas S. Dee
"Educators should also understand the limitations of research evidence. Rigorous impact evaluations...can only tell us what has worked someplace at some time—not what will work universally for educators facing specific challenges." - @tomdee.bsky.social
www.edweek.org/leadership/o...
www.edweek.org/leadership/o...
High Quality Research Rarely Informs Classroom Practice. Why? (Opinion)
The connection between education research, policy, and practice is broken. Here’s what it would take to fix it.
www.edweek.org
September 11, 2025 at 3:07 PM
"Educators should also understand the limitations of research evidence. Rigorous impact evaluations...can only tell us what has worked someplace at some time—not what will work universally for educators facing specific challenges." - @tomdee.bsky.social
www.edweek.org/leadership/o...
www.edweek.org/leadership/o...
Reposted by Thomas S. Dee
Why aren't practices based on research implemented in schools? @tomdee.bsky.social has insights, and ideas for change. www.edweek.org/leadership/o...
High Quality Research Rarely Informs Classroom Practice. Why? (Opinion)
The connection between education research, policy, and practice is broken. Here’s what it would take to fix it.
www.edweek.org
September 11, 2025 at 11:52 AM
Why aren't practices based on research implemented in schools? @tomdee.bsky.social has insights, and ideas for change. www.edweek.org/leadership/o...
Reposted by Thomas S. Dee
"...embrace opportunities for quick and meaningful wins. These are the common-sense education initiatives that share three critical features: evidentiary support, low financial costs, and scalability." - @tomdee.bsky.social www.edweek.org/leadership/o...
High Quality Research Rarely Informs Classroom Practice. Why? (Opinion)
The connection between education research, policy, and practice is broken. Here’s what it would take to fix it.
www.edweek.org
September 9, 2025 at 11:10 AM
"...embrace opportunities for quick and meaningful wins. These are the common-sense education initiatives that share three critical features: evidentiary support, low financial costs, and scalability." - @tomdee.bsky.social www.edweek.org/leadership/o...
Just out in @edweek.org's #K12BigIdeas, I criticize the quality & connectedness of education research, policy, & practice and discuss what it would take to do better.
www.edweek.org/leadership/o...
www.edweek.org/leadership/o...
High Quality Research Rarely Informs Classroom Practice. Why? (Opinion)
The connection between education research, policy, and practice is broken. Here’s what it would take to fix it.
www.edweek.org
September 8, 2025 at 3:30 PM
Just out in @edweek.org's #K12BigIdeas, I criticize the quality & connectedness of education research, policy, & practice and discuss what it would take to do better.
www.edweek.org/leadership/o...
www.edweek.org/leadership/o...
Thanks for flagging that. There seems to be some agreement on the role of post Great Recession spending declines?
July 11, 2025 at 4:25 PM
Thanks for flagging that. There seems to be some agreement on the role of post Great Recession spending declines?
I'm curious how people view hypotheses about these achievement declines. I incline towards (1) the failure to refine & sustain school accountability & (2) the rise of smart phones & social media. But that's conjectural without better evidence.
July 11, 2025 at 3:50 PM
I'm curious how people view hypotheses about these achievement declines. I incline towards (1) the failure to refine & sustain school accountability & (2) the rise of smart phones & social media. But that's conjectural without better evidence.
Reposted by Thomas S. Dee
Have we given too much "credit" to the pandemic for learning losses? Almost 50% of the post-pandemic decline in achievement on 8th grade NAEP was to be expected (without the pandemic!), simply using the same rate of declining achievement that began unfolding starting in 2013!
July 10, 2025 at 8:04 PM
Have we given too much "credit" to the pandemic for learning losses? Almost 50% of the post-pandemic decline in achievement on 8th grade NAEP was to be expected (without the pandemic!), simply using the same rate of declining achievement that began unfolding starting in 2013!
Reposted by Thomas S. Dee
The @nytimes.com spotlighted a new study from #EdWorkingPapers that examines the profound impact of immigration raids on attendance in California's Central Valley.
Read the NYT article below.
Read the NYT article below.
The current wave of federal immigration raids began in January with a “rogue” operation in California’s Central Valley.
My new study finds these raids increased school absences by 22%—a leading indicator of the resulting family stress & lost learning opportunities👇
www.nytimes.com/2025/06/16/u...
My new study finds these raids increased school absences by 22%—a leading indicator of the resulting family stress & lost learning opportunities👇
www.nytimes.com/2025/06/16/u...
Immigration Raids Add to Absence Crisis for Schools
www.nytimes.com
July 2, 2025 at 3:06 PM
The @nytimes.com spotlighted a new study from #EdWorkingPapers that examines the profound impact of immigration raids on attendance in California's Central Valley.
Read the NYT article below.
Read the NYT article below.
Reposted by Thomas S. Dee
Immigration raids in January and February increased absences by 22% in five school districts, according to a newly released Stanford study.
‘There was a lot of fear’: Central Valley immigration raids drive up absences in schools, study finds
Immigration raids in January and February increased absences by 22% in five school districts, according to a newly released Stanford study.
edsource.org
June 20, 2025 at 12:09 AM
Immigration raids in January and February increased absences by 22% in five school districts, according to a newly released Stanford study.
Reposted by Thomas S. Dee
🚨New research from SIEPR Senior Fellow @tomdee.bsky.social finds that student absences rose amid intensified immigration enforcement, indicating lost learning opportunities. 👇
bit.ly/3I1vGDJ
bit.ly/3I1vGDJ
June 17, 2025 at 7:28 PM
🚨New research from SIEPR Senior Fellow @tomdee.bsky.social finds that student absences rose amid intensified immigration enforcement, indicating lost learning opportunities. 👇
bit.ly/3I1vGDJ
bit.ly/3I1vGDJ