Geographic Spillover Effects of Prescription Drug Monitoring Programs (PDMPs)

no code implementations • 10 Jul 2021 • Daniel Guth, Shiyu Zhang

We find that electronic PDMP implementation, whereby doctors and pharmacists can observe a patient's opioid purchase history, reduces a state's opioid sales but increases opioid sales in neighboring counties on the other side of the state border.

The OxyContin Reformulation Revisited: New Evidence From Improved Definitions of Markets and Substitutes

no code implementations • 4 Jan 2021 • Shiyu Zhang, Daniel Guth

Using a novel and fine-grained source of all oxycodone sales from 2006-2014, we show that the reformulation led users to substitute from OxyContin to generic oxycodone, and the reformulation had no overall impact on opioid or heroin mortality.

Persistent Topology of Syntax

no code implementations • 18 Jul 2015 • Alexander Port, Iulia Gheorghita, Daniel Guth, John M. Clark, Crystal Liang, Shival Dasu, Matilde Marcolli

We study the persistent homology of the data set of syntactic parameters of the world languages.

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