JOURNAL ARTICLES:
· Fikru K. Alemayehu, Kai Sun, and Subal C. Kumbhakar, 2025, “Productivity Dynamics, Innovation and Endogeneity: A Semiparametric Stochastic Frontiers Approach,” European Journal of Operational Research, forthcoming.
· Kai Sun, Subal C. Kumbhakar, and Gudbrand Lien, 2025, “Productivity and Growth Decomposition: A Novel Single-index Smooth-coefficient Stochastic Frontier Approach,” European Review of Agricultural Economics, forthcoming.
· Taining Wang, Kai Sun, and Subal C. Kumbhakar, 2025, “A New Semiparametric Stochastic Frontier Model: Addressing Inefficiency and Model Flexibility Using Panel Data,” Empirical Economics, 68(6), 2477-2514. (lead article)
· Xin Geng and Kai Sun, 2022, “Estimation of A Partially Linear Seemingly Unrelated Regressions Model: Application to a Translog Cost System,” Econometric Reviews, 41(9), 1008-1046.
· Robin Sickles, Kai Sun, and Thomas Triebs, 2021, “The Optimal Use of Management,” Economic Inquiry, 59, 1346-1363.
· Kai Sun and Ruhul Salim, 2020, “A Semiparametric Stochastic Input Distance Frontier Model with Application to the Indonesian Banking Industry,” Journal of Productivity Analysis, 54, 139-156.
· Tomas Baležentis, Genovaitė Liobikienė, Dalia Štreimikienė, and Kai Sun, 2020, “The Impact of Income Inequality on Consumption-based Greenhouse Gas Emissions at the Global Level: A Partially Linear Approach,” Journal of Environmental Management, 267, 110635.
· Tomas Baležentis and Kai Sun, 2020, “Measurement of Technical Inefficiency and Total Factor Productivity Growth: A Semiparametric Stochastic Input Distance Frontier Approach and the Case of Lithuanian Dairy Farms,” European Journal of Operational Research, 285(3), 1174-1188.
· Xin Geng and Kai Sun, 2019, “Gradient Estimation of the Local-constant Semiparametric Smooth Coefficient Model,” Economics Letters, 185, 108684. (Replication package)
· Yin-fang Zhang and Kai Sun, 2019, “How Does Infrastructure Affect Economic Growth? Insights from A Semiparametric Smooth Coefficient Approach and the Case of Telecommunications in China,” Economic Inquiry, 57(3), 1239-1255.
· Farid Khan, Ruhul Salim, and Kai Sun, 2018, “Does R&D Spur Productivity Growth in Australia's Broadacre Agriculture? A semi-parametric Smooth Coefficient Approach,” Applied Economics, 50(47), 5074-5091.
· Emir Malikov, Kai Sun, and Subal C. Kumbhakar, 2018, “Nonparametric Estimates of the Clean and Dirty Energy Substitutability,” Economics Letters, 168, 118–122.
· Sumon K. Bhaumik, Ralitza Dimova, Subal C. Kumbhakar, and Kai Sun, 2018, “Is Tinkering with Institutional Quality a Panacea for Firm Performance? Insights from a Semiparametric Approach to Modeling Firm Performance,” Review of Development Economics, 22(1), 1-22. (lead article).
· Subal C. Kumbhakar, Kai Sun, and Rui Zhang, 2016, “Semiparametric Smooth Coefficient Estimation of a Production System,” Pacific Economic Review, 21(4), 464-482.
· Kai Sun, Subal C. Kumbhakar, and Ragnar Tveterås, 2015, “Productivity and Efficiency Estimation: A Semiparametric Stochastic Cost Frontier Approach,” European Journal of Operational Research, 245(1), 194-202.
· Diego Restrepo-Tobón, Subal C. Kumbhakar, and Kai Sun, 2015, “Obelix vs. Asterix: Size of U.S. Commercial Banks and its Regulatory Challenge,” Journal of Regulatory Economics, 48(2), 125-168.
· Sumon Bhaumik, Subal C. Kumbhakar, and Kai Sun, 2015, “A Note on a Semiparametric Approach to Estimating Financing Constraints in Firms,” European Journal of Finance, 21, 992-1004.
· Kai Sun, 2015, “Constrained Nonparametric Estimation of the Input Distance Function,” Journal of Productivity Analysis, 43, 85-97.
· Almas Heshmati, Subal C. Kumbhakar, and Kai Sun, 2014, “Estimation of Productivity in Korean Electric Power Plants: A Semiparametric Smooth Coefficient Model,” Energy Economics, 45, 491-500.
· Christopher F. Parmeter, Kai Sun, Daniel J. Henderson, and Subal C. Kumbhakar, 2014, “Estimation and Inference under Economic Restrictions,” Journal of Productivity Analysis, 41: 111-129.
· Kai Sun and Subal C. Kumbhakar, 2013, “Semiparametric Smooth-coefficient Stochastic Frontier Model,” Economics Letters, 120(2), 305-309.
· Subal C. Kumbhakar and Kai Sun, 2013, “Derivation of Marginal Effects of Determinants of Technical Inefficiency,” Economics Letters, 120(2), 249-253.
· R codes with a specific example; General R codes with examples
· Subal C. Kumbhakar and Kai Sun, 2012, “Estimation of TFP Growth: A Semiparametric Smooth Coefficient Approach,” Empirical Economics, 43(1), 1-24. (lead article)
· Rui Zhang, Kai Sun, Michael S. Delgado, and Subal C. Kumbhakar, 2012, “Productivity in China's High Technology Industry: Regional Heterogeneity and R&D,” Technological Forecasting and Social Change, 79, 127-141.
· Kai Sun, Daniel J. Henderson, and Subal C. Kumbhakar, 2011, “Biases in Approximating Log Production,” Journal of Applied Econometrics, 26(4), 708-714.
· JAE Data Archive: qed.econ.queensu.ca/jae/2011-v26.4/sun-henderson-kumbhakar/
PAPERS UNDER SUBMISSION:
· “Nonparametric Panel Data Estimators of the Nonparametric Panel Stochastic Frontier Analysis,” with Xin Geng
· “Estimation of A Four Component Semiparametric Stochastic Production Frontier Model with Endogenous Regressors and Determinants of Inefficiency,” with Subal C. Kumbhakar and Ragnar Tveterås