Klaus Langohr

Professor Lector
Statistics and Operation Research Department of Polytechnic University of Catalonia (UPC)

Research Areas Survival Analysis Optimization methods in Statistics

Education:

Ph.D. in Statistics, Polytechnical University of Catalonia, Barcelona, Juny 2004
Master in Statistics, University of Dortmund (Germany), Juny 1996

Current Projects:

• Member of research project MTM2012-38067-C02-01. Financed by "Ministerio de economía y competitividad. Dirección general de investigación científica y técnica. Subdirección general de proyectos de investigación". Team investigator: G.Gómez, U.Dafni, C.Forné, O.Julià, K.Langohr, N.Pérez-Álvarez, N.Porta Bleda, D.Rizopoulos, V.Gibert, C.Serrat. Grant: 162.100€. Period: January 2013 - December 2015.
• Member of "Red Nacional de Bioetadistica - Nodo Catalunya -Bio". Financed by “Ministerio de Innovación y Ciencia (MTM2010-09213-E)”. National and International participant Institutions. Investigator in charge: Carmen María Cadarso Suárez. Period: From 2010 - 2011.

Selection of Publications:

• Casals, M., Langohr, K., Carrasco, J.L., Rönnegård L. (2015). Parameter estimation of Poisson generalized linear mixed models based on three different statistical principles: a simulation study. SORT, 39 (2), 281-308.

• Langohr, K., Gómez, G. (2014). Estimation and residual analysis with R for a linear regression model with an interval-censored covariate. Biometrical journal Vol. 56(5), pp. 867-885.

• Langohr, K., G. Gómez, G. Hough (2013). Quantile estimation of the rejection distribution of food products integrating assessor values and interval-censored consumer data. SORT, 37 (2), 175-188.
• Casals, M., P. Pila, K. Langohr, J.P. Millet, J. Caylà and the Roma Population Working Group (2012). Incidence of infectious diseases and survival among the Roma population: a longitudinal cohort study. The European Journal of Public Health, 22 (2), 262-266.
• Gómez, G., M.L. Calle, R. Oller, K. Langohr (2009). Tutorial on methods for interval-censored data and their implementation in R. Statistical Modelling 9 (4), 259-97.
• Muga, R., K. Langohr, J. Tor, A. Sanvisens, I. Serra, C. Rey-Joly, A. Muñoz (2007). Survival of HIV-Infected Injection Drug Users (IDUs) in the Highly Active Antiretroviral Therapy Era, Relative to Sex-and Age-Specific Survival of HIV-Uninfected IDUs. Clinical Infectious Diseases 45, 370-6.
• Langohr, K., G. Gómez (2005). Likelihood Maximization Using Web-Based Optimization Tools: A Short Tutorial. The American Statistician 59 (2), 192-202.
• Langohr, K., G. Gómez, R. Muga (2004). A parametric survival model with an interval-censored covariate. Statistics in Medicine 23 (20), 3159-75.
• Hough, G., K. Langohr, G. Gómez, A. Curia (2003). Survival analysis applied to sensory shelf-life of foods. Journal of Food Science 68 (1), 359-62.

 

Research Areas (detailed):

Survival Analysis
Statistical methods for survival data
Methods for interval and double-censored data
Regression models with interval-censored covariates
Software for survival analysis

Optimization Methods in Statistics
Optimization problems in survival anaysis
Optimization tools for the maximization of complex likelihood functions
AMPL: A Mathematical Language for Mathematical Programming
Web-based optimization tools: The NEOS Server

Contact: