My Google Scholar profile can be found here. Below is a list of my selected research in progress, journal publications, publications in edited volumes, and some of the discussion papers and work in progress.
Selected Research in Progress
|"Econometric Modelling of Climate Systems: The Equivalence of Energy Balance Models and Cointegrated Vector Autoregressions" [Job Market Paper - available shortly]. Revise and Resubmit at the Journal of Econometrics
Short Abstract: Climate change is one of the greatest economic challenges facing humanity with potentially large costs from either action or inaction to tackle human-induced (anthropogenic) emissions. To quantify uncertainties around climate responses and empirically link economic models with climate models requires econometric modelling consistent with the underlying climate physics and the time-series properties of the data. Here, I show that energy-balance models of climate can be mapped to an econometric cointegrated system and estimated in discrete time. This equivalence provides a physical science basis for the use of econometric cointegration methods to estimate climate responses and test their feedbacks. Further, this makes it possible to quantify uncertainties around parameters in economic integrated assessment models.
|"Local Emissions Affect Local Climate: Attribution, Impacts and Policy" with Robert K. Kaufmann and Sucharita Gopal. [Available on email request]
Short Abstract: To date, most empirical studies of the impacts of climate change assume that temperatures are strictly exogenous (unaffected by) local economic activity, as the climate effects of most radiatively-active gases (e.g. CO2) are well mixed in the atmosphere. Here we test the hypothesis that local forcings from local emissions measurably affect local temperatures beyond global forcings by estimating a spatially-explicit dynamic econometric energy balance model from a 5-degree gridded panel which includes observations for global radiative forcing, temperatures, and proxies for local forcing. Results indicate that local emissions have explanatory power about local temperatures that extends beyond global radiative forcing. These results suggest that temperatures are not strictly exogenous for local economic activity, and also show that policy to slow climate change can generate local effects which changes the attractiveness of climate change policy.
|"Testing the Presence of Outliers to Assess Misspecification in Regression Models" with Xiyu Jiao. [Available shortly]
Short Abstract: The presence of outlying observations in a regression model can be indicative of model misspecification, consequently, it is important to check for possible outlier contamination. However, algorithms used to detect outliers have a positive probability of finding outliers even when, in fact, the data generation process has no outliers. Deriving distributional results on the expected retention rate of falsely discovered outliers, we propose two set of tests for the overall presence of outliers: first, tests on whether the observed proportion and number of detected outliers deviate from their expected values. Second, `scaling' tests on whether the number of detected outliers decreases proportionally with the level of significance used to detect outliers. The tests are valid for stationary as well as (stochastically) trending regressors and can readily be implemented using Autometrics in PcGive or the R-package ‘gets’.
|"Uncertain impacts on economic growth when stabilizing global temperatures at 1.5°C or 2°C warming"
with Moritz Schwarz, Kevin Tang, Karsten Haustein, and Myles R Allen, 2017. [Available on email request]
Accepted for publication in the Philosophical Transactions of the Royal Society A. DOI 10.1098/rsta.2016.0460.
|"General-to-Specific (GETS) Modelling And Indicator Saturation With The R Package Gets"
with James Reade and Genaro Sucarrat, 2017,
Earlier version available as Oxford Economics Discussion Paper, 794. Available online here.
Accepted for publication in Journal of Statistical Software.
|"Spatial heterogeneity of climate change as an experiential basis for skepticism"
with Robert K. Kaufmann, Michael L. Mann, Sucharita Gopal, Jackie A. Liederman, Peter D. Howe, Xiaojing Tang, and Michelle Gilmore, 2017, Proceedings of the National Academy of Sciences, 114(1), doi: 10.1073/pnas.1607032113
Oxford Martin School news on the study: here, additional media coverage: here.
|"Carbon Dioxide Emission-Intensity in Climate Projections: Comparing the Observational Record to Socio-Economic Scenarios"
with Max Roser 2017, Energy, 3, 718-725, doi: 10.1016/j.energy.2017.06.119
Working paper version also available as Oxford Economics Discussion Paper, 810, here.
Oxford University Science Blog on the paper: here.
|"A new archive of large volcanic events over the past millennium derived from reconstructed summer temperatures"
with Lea Schneider, Jason Smerdon, Claudia Hartl-Meier, and Jan Esper, 2017. Environmental Research Letters. doi:10.1088/1748-9326/aa7a1b.
Oxford Martin School news on the paper.
|"Detecting Volcanic Eruptions in Temperature Reconstructions by Designed Break-Indicator Saturation"
with Lea Schneider, Jason E. Smerdon, and David F. Hendry (2016), Journal of Economic Surveys. doi: 10.1111/joes.12148
Working paper version available here. Columbia University article on the paper: here.
|"Detecting Location Shifts during Model Selection by Step-Indicator Saturation"
with David F. Hendry, Jurgen A. Doornik, and Jennifer L. Castle, 2015, Econometrics, 3, 240-264, doi:10.3390/econometrics03020240.
Code for indicator saturation: isat in gets (in R), and SIS in Ox.
|"Testing Competing Models of the Temperature Hiatus: Assessing the effects of conditioning variables and temporal uncertainties through sample-wide break detection"
with Michael L. Mann and Robert K. Kaufmann, 2015, Climatic Change, 131:4, 705-718, doi: 10.1007/s10584-015-1391-5.
Working paper version available here.
|"Climate Science: Breaks in Trends"
with Myles R. Allen, 2013, Nature Geoscience, 6, 992-993, doi:10.1038/ngeo2015.
Media coverage: here.
|"Some hazards in econometric modelling of climate change"
with David F. Hendry, 2013, Earth System Dynamics, 4, 375-384, doi:10.5194/esd-4-375-2013.
Publications in Edited Volumes
|"All Change! The Implications of Non-stationarity for Empirical Modelling, Forecasting and Policy"
with David F. Hendry (2016), Oxford Martin Policy Paper, (peer-reviewed).
Available online here.
Oxford Martin School article on the paper: here.
|"Anthropogenic Influences on Atmospheric CO2"
with David F. Hendry, 2013, Handbook on Energy and Climate Change. Ch. 12. R. Fouquet ed. Edward Elgar. Available online here.
Discussion Papers and Further Papers in Progress (please email for availability)
|"Exogeneity in Climate Econometrics"
2017, Oxford Department of Economics Working Paper. Available online here.
|"Testing for time-varying predictive accuracy using bias-corrected indicator saturation"
Oxford Economics Working Paper [Available upon email request]
Code to implement the test: isattest function in the latest version of our R package gets
|"Are we running out of resources?"
with Cameron Hepburn, Alex Teytelboym, and Alexander Pfeiffer
|"Assessing poolability, stability over time, and the presence of outliers in fixed-effects panel regressions using indicator saturation"
With J. Reade and G. Sucarrat.
With J. A. Doornik and D.F. Hendry.
|"Quantifying the Uncertainty around Break Dates in Models using Indicator Saturation"
With D. F. Hendry. [Available on email request]
|"Step Indicator Saturation"
with David F. Hendry and Jurgen A. Doornik, 2013, Oxford Economics Discussion Paper, 658.
New version published as "Detecting Location Shifts during Model Selection by Step-Indicator Saturation", 2015, Econometrics, 3, 240-264. Available online here.