Professional Interests

• Time Series Analysis
• Empirical Finance
• Econometric Forecasting
• Panel Data Analysis
• Factor Models

Professional Activities

• Associate Editor of the International Journal of Forecasting (2019-)

• Associate Editor of Journal of Business and Economic Statistics (2017-)

• Associate Editor of Econometric Reviews (2014-)

• Associate Editor of Economics Letters  (2012-)

• Associate Editor of Econometric Journal (2012-)
• Associate Editor of Empirical Economics (2003-2011)
• Associate Editor of Computational Statistics (2003-2015)
• Member of the Executive Councel of the Verein für Socialpolitik
• Research Fellow vom IZA
• Member of the Scientific Committee of the International Conference on Panel Data
• Member of the Scientific boad of  CASE

Publications

• Backward CUSUM for Testing and Monitoring Structural Change with an Application to COVID-19 Pandemic Data (joint with Sven Otto),   forthcoming in: Econometric Theory (2022). 
• Bias-corrected method of moments estimators for dynamic panel data models (joint with Sebastian Kripfganz and Kazuhiko Hayakawa), Econometrics and Statistics (2022), 24, 116-132.
• Estimation of Heterogeneous Panels with Systematic Slope Variations (joint with Nazarii Salish), Journal of Econometrics (2021), 220, Issue 2, 399-415
• Alternative estimation approaches for the factor augmented panel data model with small T (joint with Philipp Hansen), Empirical Economics (2021), ) 60, 327-351.
• Double Filter Instrumental Variable Estimation of Panel Data Models with Weakly Exogenous Variables (joint with Kazuhiko Hayakawa and Meng Qi), Econometric Reviews (2019), 38, 1055–1088.
• Alternative GMM Estimators for Spatial Regression Models (joint with Christoph Wigger),  Spatial Economic Analysis, 13 (2018), No.2, 148-170. download
• Assessing Causality and Delay within a Frequency Band (joint with Sven Schreiber), Econometrics and Statistics, 6 (2018), 57-73.
• LM-type tests for slope homogeneity in panel data models (joint with Nazarii Salish and Christoph Roling), Econometrics Journal, 19 (2016), 166-202.
• Assessing the Forward Premium Puzzle: A factor augmented panel data approach (joint with Katja Mann), in: Cheung, Y.W. and Westermann, F. (ed.) "International Currency Exposure", MIT Press (2017)
• A simple model for now-casting volatility series (joint with Christian Hafner),  International Journal of Forecasting, 32 (2016) 1247–1255.
• Testing for Serial Correlation in Fixed Effects Panel Data Models, (joint with Benjamin Born), Econometric Reviews, 35 (2016), No. 7, 1290-1316
• Analyzing international business and financial cycles using multi-level factor models: A Comparison of Alternative Approaches (joint with Sandra Eickmeier), Advances in Econometrics, Vol. 15 (2016), 177-214.  download
• Forecasting inflation rates using daily data: A nonparametric MIDAS approach(joint with Christoph Roling), Journal of Forecasting, 34 (2015), 588-603.
• Instrumental Variable and Variable Addition Based Inference in Predictive Regressions: (joint with Matei Demetrescu), Journal of Econometrics, 187 (2015), 358–375
• Analyzing international business and financial cycles using multi-level factor models: A Comparison of Alternative Approaches (joint with Sandra Eickmeier), Advances in Econometrics, Vol. 15 (2016), 177-214.  download
• The Analysis of Macroeconomic Panel Data, in: The Oxford Handbook of Panel Data, B. Baltagi (ed.), Chapter 15, 2015. 453-492.
• Analyzing Business Cycle Asymmetries in a Multi-level Factor Model: , (joint with Sandra Eickmeier)  Economics Letters, 127 (2015), 31-34.
• Econometric Tests for Speculative Bubbles, Bonn Journal of Economics, Vol. III(1), 115-129. http://www.bje.uni-bonn.de/download-the-latest-issue-1/volume-iii-1-july-2014/breitung
• When Bubbles Burst: Econometric Tests based on Structural Breaks (joint with Robinson Kruse)download  (2013), 54, 911 – 930.
• A canonical correlation approach for selecting the number of dynamic factors (joint with Uta Pigorsch), Oxford Bulletin of Economics and Statistics, 75 (2013), 23-36. Factor Models (joint with In Choi)
• Factor Models, in: N. Hashimzade and M.A. Thornton (eds), Empirical Macroeconomics, Edward Elgar, Chapter 11 (2013), 249-265.
• Lessons from a Decade of IPS and LLC (joint with Joakim Westerlund), Econometric Reviews, 32 (2013), 547-591
• Quantifying survey expectations: What's wrong with the probability approach? (joint with Maik Schmeling, International Journal of Forecasting, 29 (2013) 142–154.
• Testing for Speculative Bubbles in Stock Markets: A Comparison of Alternative Methods (joint with Ulrich Homm), Journal of Financial Econometrics, 10 (2012), 198-231.
• GLS estimation of dynamic factor models, (joint with Jörn Tenhofen), Journal of the American Statistical Association, 106 (2011), 1150–1166.
• Testing for structural breaks in dynamic factor models, (joint with Sandra Eickmeier), Journal of Econometrics, 163, 71–84, 2011
• Simple Regression Based Tests for Spatial Dependence, (joint with Benjamin Born), Econometrics Journal, 14 (2011), 330-342.
• Generalized Estimation Equations: Notes on the Choice of the Working Correlation Matrix, Comment, Methods of Information in Medicine, 49, (2010), 426-427.
• Unit root testing in practice dealing with uncertainty over the trend and initial condition, Comment, Econometric Theory, 25 (2009), p. 649-653
• Real-time forecasting of German GDP based on a large factor model with monthly and quarterly data, (joint with Christian Schumacher), International Journal of Forecasting, 24 (2008), 386–398
• Testing for Unit Roots in Panels with a Factor Structure, (joint with Samarjit Das), Econometric Theory, 24 (2008), 88-108
• Unit Roots and Cointegration in Panels, (joint with Hashem Pesaran), in: L. Matyas and P. Sevestre (eds), The Econometrics of Panel Data: Fundamentals and Recent Developments in Theory and Practice, Springer, 2008, Chap. 9, p. 279-322.
• Longitudinal Data Analysis with Linear Regression, (joint with Remy Slama and Axel Werwatz), in: W. Härdle, Y. Mori and P. Vieu (eds), Statistical Methods for Biostatistics and related fields, Heidelberg: Springer, 2006
• How Synchronized are Central and East European Economies with the Euro Area? Evidence from a Structural Factor Model , (joint with Sandra Eickmeier), Journal of Comparative Economics, 34 (2006), 538-563
• Testing for short- and long-run causality: A frequency domain approach, (joint with Bertrand Candelon), Journal of Econometrics, 12 (2006), 363-378
• A Residual-Based LM Type Test Against Fractional Cointegration, (joint with Uwe Hassler), Econometric Theory, 22 (2006), 1091-1111
• Bidder behavior in repo auctions without minimum bit rate: Evidence from the Bundesbank, (joint with Tobias Linzert and Dieter Nautz), Journal of International Financial Markets, Institutions and Money, 16 (2006), 215-230
• Dynamic Factor Models (joint with Sandra Eickmeier) in: O. Hübler and J. Frohn (eds.), Modern Econometric Analysis, Chapter 3, Springer 2006. PDF-file
• A parametric approach to the estimation of cointegration vectors in panel data, Econometric Reviews, 24 (2005), 151-173
• Panel Unit Root Tests Under Cross Sectional Dependence, (joint with Samarjit Das) Statistica Neerlandica, 59(4), (2005), 1-20
• Purchasing Power Parity during Currency Crises: A Panel Unit Root Test under Structural Breaks, (joint with Bertrand Candelon), Review of World Economics, 141 (2005), 124-140
• Structural Vector Autoregressive Modelling and Impulse Response Analysis, (joint with Ralf Brüggemann and Helmut Lütkepohl), in: H. Lütkepohl and M. Kräzig (eds.), Applied Time Series Econometrics, Cambridge University Press, Cambridge, 2004, Chapter 4
• Nonparametric Tests for Unit Roots and Cointegration, Journal of Econometrics, 108 (2002), 343-363
• On the Properties of Some Tests for Common Stochastic Trends, (joint with Carsten Trenkler), Econometric Theory, 18 (2002), 1336-1349
• Temporal Aggregation and Spurious Instantaneous Causality in Multiple Time Series Models, (joint with Norman R. Swanson), Journal of Time Series Analysis, 23 (2002), 651-666
• Inference on the Cointegration Rank in Fractionally Integrated Processes , (joint with Uwe Hassler) , Journal of Econometrics, 110 (2002), 167-185
• Bidder behavior in repo auctions without minimum bit rate: Evidence from the Bundesbank (joint with Tobias Linzert and Dieter Nautz), forthcoming in: Journal of International Financial Markets, Institutions and Money
• Prognoseeigenschaften alternativer Indikatoren für die Konjunkturentwicklung in Deutschland (joint with Doris Jagodzinski), Konjunkturpolitik, 47 (2001), 292-314
• The empirical performance of the ECB'sRepo auctions: Evidence from aggregated and individual bidding data (joint with Dieter Nautz), Journal of International Money and Finance, 20 (2001), 839-856
• Rank Tests for Nonlinear Cointegration Relationships, Journal of Business and Economic Statististics, 19 (2001), 331-340
• A Convenient Representation for Structural Vector Autoregressions, Empirical Economics, 26 (2001), 447-459
• Is there a Common European Business Cycle? New Insights from a Frequency Domain Analysis (joint with Bertrand Candelon), Vierteljahrshefte zur Wirtschaftsforschung, 70 (2001) 331-338
• Nonlinear Error Correction and the Efficient Market Hypothesis: The case of dual class shares, (joint with C. Wulff), German Economic Review, 2 (2001), 419-434
• Structural Inference in Cointegrated Vector Autoregressive Models, Habilitation Thesis, Humboldt University Berlin, July 2000, e-book
• The Local Power of Some Unit Root Tests for Panel Data, in: B. Baltagi (ed.), Nonstationary Panels, Panel Cointegration, and Dynamic Panels, Advances in Econometrics, Vol. 15, JAI: Amsterdam, 2000, p. 161-178. Abstract, PS-file for full WP version
• The Beveridge-Nelson Decomposition: A Different Perspective with New Results, (joint with V. Gomez), Journal of Time Series Analysis, 20 (1999), 527-536
• Alternative GMM Methods for Nonlinear Panel Data Models, , (joint with M. Lechner), in: Matyas, L. (ed.), Generalised Methods of Moments Estimation, Cambridge University Press, 1999, 248-274
• Simulation Based Methods of Moments in Empirical Finance, (joint with R. Liesenfeld), in: Matyas, L. (ed.), Generalised Methods of Moments Estimation, Cambridge University Press, 1999, 275-298
• Short Run Comovement, Persistent Shocks and the Business Cycle, (joint with M. Heinemann), Jahrbücher für Nationalökonomie und Statistik, 217 (1998), 436-448
• Neuere Entwicklungen auf dem Gebiet ökonometrischer Strukturmodelle: Strukturelle Vektorautoregressionen, Ifo Studien, 44 (1998), 371-392
• Nonparametric Tests for Nonlinear Cointegration in: Apostolos-Paul N. Refenes, Andrew N. Burgess, John E. Moody, Decision Technologies for Computational Finance: Proceedings of the fifth International Conference Computational Finance, Advances in Computational Management Science Volume 2, Springer (1998)
• Impulse Response Analysis of Vector Autoregressive Processes, (joint with H. Lütkepohl), in: Heij, C., Schumacher, H., Hanzon, B. and Praagman, C., System Dynamics in Economic and Financial Models, New York: John Wiley (1998)
• On Phillips-Perron Type Tests for Seasonal Unit Roots (joint with P.H. Franses), Econometric Theory, 14 (1998) , 200-221
• Testing for Unit Roots in Panel Data Using a GMM Approach, Statistical Papers, 38 (1997), 253-269
• Rank Test for Unit Roots, (joint with C. Gourieroux), Journal of Econometrics, 81 (1997), 7-28
• Estimation de modeles non lineaires sur donnees de panel par la methode des moments generalises, (joint with M. Lechner), Economie et Prevision, 72, (1996), 191-203
• Some GMM Estimation Methods and Specification Tests for Nonlinear Models, (joint with M. Lechner), in: The Econometrics of Panel Data, L. Matyas and P. Sevestre (eds.), 2nd edition, (1996), Kluwer: Dordrecht, 583-612
• Impulse Response Functions for Periodic Integration, (joint with P.H. Franses), Economics Letters, 55 (1996), 35-40
• Modified Stationarity Tests with Improved Power in Small Samples, Statistical Papers, 36 (1995), 77-95
• Testing for Unit Roots in Panel Data: Are wages on different bargaining levels cointegrated?, (joint with W. Meyer), Applied Economics, 26 (1994), 353-361
• Some Simple Tests of the Moving-Average Unit Root Hypothesis, Journal of Time Series Analysis, 15 (1994), 351-370
• A Model Based Seasonal Adjustment Method Using the Beveridge-Nelson Decomposition, Allgemeines Statistisches Archiv, 78 (1994), 365-385
• Ist die empirische Makroökonomik eine wissenschaftliche Illusion?, (joint with M. Heinemann and F. Haslinger), Jahrbuch Ökonomie und Gesellschaft, Voigt et al. (Hrsg.), Campe Verlag, (1992)
• Dynamische Modelle für die Paneldatenanalyse, Dissertation, (1992), Frankfurt: Haag und Herchen
• The Null Distribution of the F-Test in the Linear Regression Model with Autocorrelated Disturbances, , (joint with W. Krämer and J. Kiviet), Statistica, 50, (1991)
• Bias Correction and Bootstrapping of Error Component Models for Panel Data: Theory and Applications', (joint with L. Bellmann und J. Wagner), Empirical Economics, 14, (1989)