Recent Working Papers

Identifying Exchange Rates Common Factors June 2015 (with Ryan Greenaway-McGrevy, Nelson C. Mark and Jyh-Lin Wu)

The Role of Labor Share in Relative Price Divergence May 2015 (with Horag Choi, Ryan Greenaway-McGrevy and Youngse Kim)

"Improved Two-Sample Comparisons for Bounded Experimental Data", March 2015 (with Jianning Kong and Jason Parker)

"Estimation of Treatment Effects in Repeated Public Good Experiments" January 2015, Additional MC results

Pooling is harmful sometimes April 2015. Additional MC results

"Estimation of Treatment Effects under Multiple Equilibria in Repeated Public Good Experiments", under revision (with Jianning Kong), Additional MC results

STATA CODE for 1 & 2: (version 2).


Published Papers and Book Chapters

All papers below are copyrighted by their publishers and are not to be reproduced without the permission of the publishers.


"Identification of Unknown Common Factors: Leaders and Followers" forthcoming in Journal of Business, Economics & Statistics (with Jason Parker), Additional MC results, Example GAUSS Code


Lag Length Selection in Panel Autoregression forthcoming in Econometric Review (with Chirok Han and Peter C.B. Phillips) Gauss Code

Efficient Estimation and Inference for Difference-In-Difference Regressions with Persistent Errors" forthcoming in Advances in Econometrics (with Ryan Greenaway-McGrevy and Chirok Han)

Average Estimation of Dynamic Panel Models with Nonstationary Initial Condition" forthcoming in Advances in Econometrics (with John Chao and Myungsup Kim)

Dynamic Panel Analysis under Cross-Sectional Dependence Political Analysis, Vol 22(2), 258--273 (with K. Gaibulloev and T. Sandler).

Of Nickell Bias, Cross-Sectional Dependence, and Their Cures: Reply. Political Analysis, Vol 22(2), 279--280 (with K. Gaibulloev and T. Sandler).

X-Differencing and Dynamic Panel Model Estimation, Econometric Theory, 30(1), 201--251. (with Chirok Han and P.C.B. Phillips)


"Common Drivers of Transnational Terrorism: Principal Component Analysis" Economic Inquiry, 707-721. (with K. Gaibulloev and T. Sandler)


"When Are Pooled Panel-Data Regression Forecasts of Exchange Rates More Accurate than the Time-Series Regression Forecasts?", Handbook of Exchange Rates (with Nelson C. Mark) 256-281.

Edited by J. James, I.W. Marsh and L. Sarno. John Wiley & Sons, Inc.

"Standardization and Estimation of the Number of Factors for Panel Data", Journal of Economic Theory and Econometrics, 2012, 23(2), 79-88 (with Ryan Greenaway-McGrevy and Chirok Han)

Estimating the Number of Common Factors in Serially Dependent Approximate Factor Models, Economics Letters 2012, 116, 531--534 Additional MC results (with Ryan Greenaway-McGrevy and Chirok Han)

Asymptotic Distribution of Factor Augmented Estimators for Panel Regression Journal of Econometrics 2012, 169, 48--53 (with R. Greenaway-McGrevy and C. Han).


Uniform Asymptotic Normality in Stationary and Unit Root Autoregression, Econometric Theory 2011, 27 (6), 1117--1151 (with C. Han and P.C.B. Phillips)


Bias Reduction in Dynamic Panel Data Models by Recursive Mean Adjustment under Cross Section Dependence Oxford Bulletin of Economics & Statistics, 2010, 72 (7), 567--599 (with CY Choi and Nelson C. Mark)


Panel Unit Root Tests under Cross Section Dependence with Recursive Mean Adjustment Economics Letters 2009, 105 (1). 123-126, Detail Critical values for CRMA tests (Excel File).Example Gauss Code

Economic Transition and Growth Journal of Applied Econometrics 2009, 24, 1153-1185 (with P.C.B. Phillips). Example Gauss Code


Endogenous Discounting, the World Savings Glut and the U.S. Current Account 2008 (with Horag Choi and Nelson C. Mark) Journal of International Economics, 3053.


Transition Modeling and Econometric Convergence Tests 2007 (with P.C.B. Phillips) Econometrica, Vol 75, 1771-1855.  Power Point Slides by Sul, Gauss Code for Clustering Algorithm Data

Some Empirics on Economic Growth under Heterogeneous Technology: 2007 (with P.C.B. Phillips) Journal of Macroeconomics, 455-469.

Bias in Dynamic Panel Estimation with Fixed Effects, Incidental Trends and Cross Section Dependence 2007 (with P.C.B. Phillips). Journal of Econometrics, 137, 162-188.


Unbiased Estimation of the Half-Life to PPP Convergence in Panel Data 2006, (with C.Y. Choi and N.C. Mark) Journal of Money, Credit, and Banking, 921-938. Data, Gauss Code


Prewhitening Bias in HAC Estimation 2005 (with P.C.B. Phillips and C.Y. Choi) Oxford Bulletin of Economics & Statistics, vol. 67, 517-546. Additional Monte Carlo Results

Dynamic Seemingly Unrelated Cointegrating Regression 2005 (with N.C. Mark and M. Ogaki), Review of Economic Studies, 72, 797-820.  Gauss Code


Dynamic Panel Estimation and Homogeneity Testing Under Cross Section Dependence  (with P.C.B. Phillips), Econometrics Journal, 2003, Vol. 6. 217260. Gauss Code

Cointegration vector estimation by panel DOLS and long-run money demand  (with N.C. Mark), Oxford Bulletin of Economics & Statistics, 2003, Vol 65, 655-680. Gauss Code (Updated Aug 2010)


Spatial Market Efficiency and Policy Regime Change: Seemingly Unrelated Error Correction Model Estimation (with S.R. Thompson, M.T. Bohl), American Journal of Agricultural Economics, 2002, 84(4), 10421053.


Nominal Exchange Rates and Monetary Fundamentals: Evidence from a Seventeen Country Panel  (with N.C. Mark), Journal of International Economics, 2001, 53, 29-52.


Excess Volatility of Realized Excess Profit from Currency Speculation in a Two-Country General Equilibrium Model   Review of International Economics, 1999, 7, 280-292.

Does Ex Post Uncovered Interest Differential Reflect on the Degrees of Capital Mobility?  Applied Economics Letters, 1999, 6, 97-102.