@TymonSloczynski

Associate Professor of Economics @BrandeisU, interested in microeconometrics, applied econometrics, causal inference, and economic history.

 Cambridge, MA
tslocz.github.io/
Joined April 2020
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I am very happy to announce that my paper, "Interpreting OLS Estimands When Treatment Effects Are Heterogeneous: Smaller Groups Get Larger Weights," is forthcoming in @restatjournal. Below, I explain its contribution & implications for applied work. doi.org/10.1162/rest_a_00953 1/n

Interpreting OLS Estimands When Treatment Effects Are Heterogeneous: Smaller Groups Get Larger...

Abstract. Applied work often studies the effect of a binary variable (“treatment”) using linear models with additive effects. I study the interpretation of the OLS estimands in such models when...

direct.mit.edu
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Jeffrey Wooldridge@jmwooldridgeJun 1
I'd like to announce that drlate, a Stata module for doubly robust estimation of the local average treatment effect (LATE) and the local average treatment effect on the treated (LATT), is now available in SSC.
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Professor @TymonSloczynski presented his paper, "Quantifying the Internal Validity of Weighted Estimands" (with Alexandre Poirier), at the 2026 Interactions Conference, which was hosted by the Becker Friedman Institute for Economics at the University of Chicago on May 15, 2026.
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AEA Journals@AEAjournalsApr 28
Forthcoming in the AER: "The Effect of Omitted Variables on the Sign of Regression Coefficients" by Matthew A. Masten and Alexandre Poirier. aeaweb.org/articles?id=10.12…

The Effect of Omitted Variables on the Sign of Regression Coefficients

(July 2026) - We show that, depending on how the impact of omitted variables is measured, it can be substantially easier for omitted variables to flip coefficient signs than to drive them to zero....

aeaweb.org
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Jonathan Roth@jondr44Apr 23
I’m really excited about this paper! Some of my work has pointed out problems in empirical work, but this one is all about new 🔧s. If you (or your referees) want to know about the mechanisms by which a treatment affects an outcome, you may be interested. A 🧵.
The Review of Economic Studies@RevEconStudiesApr 20
Want to know about the mechanisms by which a treatment affects an outcome? This paper develops tools for testing hypotheses about mechanisms under weak assumptions. Check it out! New paper by @jondr44 and Kwon: restud.com/testing-mechanism… #REStud #EconX #EconTwitter
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Revised version out: Quantifying the Internal Validity of Weighted Estimands (w/ Alex Poirier, Georgetown) We study when weighted estimands such as OLS/2SLS/TWFE can be read as ATEs for a subpopulation, and how big that subpopulation can be. Link below. 1/13
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Example (3 time periods): internal validity is highest when two-thirds of units are treated in the last period – that's when TWFE weights become uniform. 12/13
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Application (unilateral divorce laws → female suicide, 1964–1996): TWFE ≈ –0.6 (ns). ATT estimators ≈ –10.2 (p=0.001) and –5.5 (p=0.138). Internal validity of TWFE ≈ 0 (uniform), rising to ~40–60% with estimated effects. Not very representative here. 13/13
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Jeffrey Wooldridge@jmwooldridge23 Sep 2025
Replying to @TymonSloczynski
@TymonSloczynski , @sderyauysal, and I have an improved version of our covariate balancing paper: arxiv.org/abs/2310.18563 The results are elegant (🙂) and practical. We show a particular covariate balancing propensity score, inverse probability tilting, has nice properties.

Covariate Balancing and the Equivalence of Weighting and Doubly...

How should researchers adjust for covariates? We show that if the propensity score is estimated using a specific covariate balancing approach, inverse probability weighting (IPW), augmented...

arxiv.org
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In a study published in the American Economic Review, Prof. @aaehawkins finds that a large cash transfer to families of low-weight infants didn't "undo" long-term disadvantages. aeaweb.org/articles?id=10.12…

The Long-Term Effects of Income for At-Risk Infants: Evidence from Supplemental Security Income

(September 2025) - The Supplemental Security Income program uses a birth weight cutoff at 1,200 grams to determine eligibility. Using birth certificates linked to administrative records, we find...

aeaweb.org
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“The Long-Term Effects of Income for At-Risk Infants: Evidence from Supplemental Security Income” with @aaehawkins (@BrandeisEcon) @chrishollrah @smilleralert @mitchwongmdphd, and Gloria Aldana is now out in the American Economic Review! aeaweb.org/issues/816

American Economic Review

Vol. 115 No. 9 September 2025

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