Christopher Harshaw
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View article: The Conflict Graph Design: Estimating Causal Effects under Arbitrary Neighborhood Interference
The Conflict Graph Design: Estimating Causal Effects under Arbitrary Neighborhood Interference Open
A fundamental problem in network experiments is selecting an appropriate experimental design in order to precisely estimate a given causal effect of interest. In this work, we propose the Conflict Graph Design, a general approach for const…
View article: Design and analysis of bipartite experiments under a linear exposure-response model
Design and analysis of bipartite experiments under a linear exposure-response model Open
A bipartite experiment consists of one set of units being assigned treatments and another set of units for which we measure outcomes. The two sets of units are connected by a bipartite graph, governing how the treated units can affect the …
View article: A General Design-Based Framework and Estimator for Randomized Experiments
A General Design-Based Framework and Estimator for Randomized Experiments Open
We describe a design-based framework for drawing causal inference in general randomized experiments. Causal effects are defined as linear functionals evaluated at unit-level potential outcome functions. Assumptions about the potential outc…
View article: Maternal antibiotics disrupt microbiome, behavior, and temperature regulation in unexposed infant mice
Maternal antibiotics disrupt microbiome, behavior, and temperature regulation in unexposed infant mice Open
Maternal antibiotic (ABx) exposure can significantly perturb the transfer of microbiota from mother to offspring, resulting in dysbiosis of potential relevance to neurodevelopmental disorders such as autism spectrum disorder (ASD). Studies…
View article: Elevated ghrelin alters the behavioral effects of perinatal acetaminophen exposure in rats
Elevated ghrelin alters the behavioral effects of perinatal acetaminophen exposure in rats Open
A growing body of evidence links prenatal and early postnatal acetaminophen (APAP) exposure to atypical development of brain and behavior. In adult rodents, APAP is known to produce oxidative stress and lower anxiety‐related behavior follo…
View article: Optimized variance estimation under interference and complex experimental designs
Optimized variance estimation under interference and complex experimental designs Open
Unbiased and consistent variance estimators generally do not exist for design-based treatment effect estimators because experimenters never observe more than one potential outcome for any unit. The problem is exacerbated by interference an…
View article: Design and Analysis of Bipartite Experiments under a Linear Exposure-Response Model
Design and Analysis of Bipartite Experiments under a Linear Exposure-Response Model Open
A bipartite experiment consists of one set of units being assigned treatments and another set of units for which we measure outcomes. The two sets of units are connected by a bipartite graph, governing how the treated units can affect the …
View article: Balancing covariates in randomized experiments using the Gram-Schmidt walk.
Balancing covariates in randomized experiments using the Gram-Schmidt walk. Open
The design of experiments involves a compromise between covariate balance and robustness. This paper introduces an experimental design that admits precise control over this trade-off. The design is specified by a parameter that bounds the …
View article: Balancing Covariates in Randomized Experiments with the Gram-Schmidt Walk Design
Balancing Covariates in Randomized Experiments with the Gram-Schmidt Walk Design Open
The design of experiments involves a compromise between covariate balance and robustness. This paper provides a formalization of this trade-off and describes an experimental design that allows experimenters to navigate it. The design is sp…